I read the posts about the "longest signed distance between gas stations"; these had a consensus of I-70 in Utah's 106 miles (freeway) and US 6 in Nevada's 160 miles (non-freeway). However, I was interested in seeing about your experiences regarding distances in other states, too (obviously smaller distances). Either freeway or non-freeway are cool with me, but I'll focus on freeway distances for now.
Iowa appears to have a gap of about 40 miles between services south of Council Bluffs on I-29. The two gas stations (Love's and BP) on Exit 35 closed permanently (?, I know Love's won't reopen) due to flooding, meaning that travelers have to go from Exit 10 (Percival IA/Nebraska City NE, which has plenty of services - Pilot, Sapp Bros) to Exit 49 in Council Bluffs (a Shell/TA, Casey's and Sam's Club). That's 39-40 miles, and no sign at all.
South Dakota appears to have no stations off I-29 between Brookings and Watertown (I don't remember any and Gasbuddy confirms), a distance of about 45 miles. No sign here either.
Minnesota has a number of ~15 mile gaps along I-90, but the longest (by far) and the only one breaking 20 miles is between Nodine and St. Charles, at 34 miles.
I'm not sure what a fair criteria about how far from the road services are available should be - maybe 3 or so miles?. 5 miles is quite a diversion for gas for me. My dad's rule has always been that he won't stop for gas if he can't see it from the road.
At any rate, interested to see what you all have seen/experienced in your travels!
I would imagine I-40 or I-15 have the longest gaps. I-40 between Ludlow East to Fenner is pretty lengthy. If I recall correct there isn't any active service stations on I-15 between Barstow and Baker. I-5 has some long gaps on the West Side Freeway but I don't think many top 20 miles. I-10 might be up there too between Desert Center and Blythe.
On conventional roads in California it seems CA 62's advertised 100 miles is the legit article. I probably could string a couple low clearance roads in National Forests together that would probably beat 100 miles handily though.
Arizona has a couple lengthy freeway gas gaps. I want to say Vicksburg to Tonopah might be the longest on I-10.
Not sure what it is for Wisconsin, but it can't be more than 40 miles or so. Even the sparsely populated northwoods have gas stations in all of the unincorporated towns that pop up along the state highways.
US 6 as you mention, but limiting it to freeways, Nevada's longest is the 58 miles from Wells to West Wendover on I-80.
The gas stations at I-29 Exit 10 are the only gas stations between Rock Port, MO and Council Bluffs, IA, a distance of about 65 miles!
Here are the longest stretches I could find in Michigan (along freeways; only stretches of 20 or more miles included).
I-75:
Exit 190 to Exit 212
Exit 212 to Exit 244
Exit 344 to Exit 378
US-127:
Exit 194 to I-75 Exit 251
There is no gas on HI 200, the much-improved highway across the Big Island, except perhaps at an Army base closed to the general public. From Hilo to the closest gas station near the west end, in Waimea (Kamuela), is about 60 miles, and about 75 miles from Hilo to Kailua-Kona. There are closer gas stations to Hilo on HI 19 looping around the Big Island's north coast, or HI 11 along the south coast, but both take more time and distance to get to most destinations on the west side of the island.
AK 11 has the famous 240-mile gap (http://www.alaskaroads.com/nextservices240miles+ArcticOceanaccess-signs-large_DSC4171.jpg) between the gas stations in Coldfoot and Deadhorse. That's the longest gap in the U.S., but not in North America (some gaps up to 500 km in Canada).
For West Virginia, I believe the longest distance is 58 miles on WV 92 between Green Bank and White Sulphur Springs.
For Michigan I'm sure it's somewhere in the Upper Peninsula. I'll try to figure it out but someone might beat me to it.
Okay, some two-lane distances for MN (please correct me if they're not accurate; I used Google Maps and Gasbuddy)
Unsurprisingly, the majority were in the north/northwestern part of the state.
MN 89 - Grgyla to Redlake (56 miles)
MN 1 - Ely to Finland (56 miles)
MN 6 - Big Falls to Talmoon (46 miles)
MN 72 - Baudette to Waskish (41 miles)
MN 9 - Herman to Breckenridge (38 miles)
MN 9 - Ada to Crookston (35 miles)
US 59 - Morris to Barrett (24 miles)
46 miles on M-28 from Brimley to Newberry might be the longest in Michigan.
In Arizona, the answer is probably on Interstate 8. There's a 21 mile stretch without exits, and an even longer stretch through the Sonoran Desert National Monument where no motorist services are offered.
Pennsylvania has an oddly long gap for an east coast state. Both gaps in services are on the PA Turnpike, which makes sense.
PA Turnpike WB: 82 miles between the New Stanton Service Plaza (MP 78) and Mahoning Valley Service Plaza on the Ohio Turnpike (meaning this gap crosses state lines). However, for free you can take exit 28 and get services there (there are no signs telling you this), shortening the gap to 50 miles.
PA Turnpike EB: 53 miles between Mahoning Valley and Oakmont-Plum Service Plazas. Exiting at exit 28 shortens this gap in services to 32 miles. The next largest gap in services is 49 miles, between the Valley Forge and Woodrow Wilson Service Plazas (the latter on the NJ Turnpike). You can exit and re-enter at US 130 for free before entering the NJ Turnpike, shortening this gap to 38 miles.
In Idaho:
US 12 - Lowell to Powell, 71 miles
In fact, there is no cell phone service from Kooskia on outside of the emergency phones placed at MM 120, 139, and 169.
When I used to drive back and forth between Minneapolis and Cape Cod, part of my route was I-86 from the Erie area to Binghamton (where I'd usually go I-81 to I-88 after that), and I'd usually pass through that late at night. I realized on my first trip through that stretch (1996 for a convention in Cleveland) that there were no gas stations open late at night between Horseheads and the TA just south of where I-86 meets I-90. So I'd always make sure to hit them both on every trip through that area.
Sadly, the Horseheads Sunoco no longer exists...at least not in its original location.
72 miles from Bakersfield, TX to Ozona, TX. Almost ran out of gas once hoping to make it to Fort Stockton.
The longest distance between gas stations in Texas appears to be 916 miles, from an Allsup's in Texline to a Stripes on South Padre Island.
I love the Kancamagus Highway (NH 112) between Lincoln and Conway, NH. At each end is this sign:
https://www.google.com/maps/@44.0601909,-71.6239638,3a,29.3y,45.98h,91.74t/data=!3m6!1e1!3m4!1s9TQo5QFxq2S5wqOSPSNgpA!2e0!7i13312!8i6656
NO GAS - NEXT 32 MILES
And outside of some campgrounds and scenic areas/picnic spots/hiking trails, there is nothing in that 32 mile stretch! Its mostly USFS property.
I can't picture it being any more than 20 miles in Ohio. The state even puts up signs on Interstates when exits are more than only 10 miles apart. Those signs have to make Westerners laugh.
Hmm, no, there is probably some stretch in Monroe/Noble/Washington Counties that is more than 20 miles. Maybe Athens/Meigs/Gallia/Lawrence as well.
Some more long stretches in Michigan (unsure of exact mileage; according to GasBuddy):
US-2 - Wakefield to Watersmeet
US-41 - Michigamme to L'Anse
M-28 - Bruce Crossing to Watton
M-38 - Ontonagon to Baraga
M-48 - Pickford to DeTour
M-64 - Ontonagon to Bergland, then Bergland to the WI state line (there's a station not far across the WI line)
M-94 - Manistique to Shingleton, then Munising to Sawyer Airport
M-123 - Trout Lake to Paradise
M-134 - Cedarville to DeTour
Maryland, not that far. Possibilities include:
1. I-68 between Flintstone (Exit 68) and U.S. 220 north (Exit 48), about 9.2 miles.
2. I-95 between MD-279 (Exit 109) and MD-272 (Exit 100), about 8.5 miles (longest distance between freeway interchanges in the state).
3. I-70 between MD-85, Frederick (Exit 54) and MD-17, Myersville (Exit 42), about 12 miles (there are intervening interchanges with limited-access highways and a half interchange at U.S. 40 Alternate that has no services nearby).
Quote from: Max Rockatansky on March 23, 2020, 04:23:28 PM
Arizona has a couple lengthy freeway gas gaps. I want to say Vicksburg to Tonopah might be the longest on I-10.
My guess as the longest gassless gap in AZ is between Wickenburg and Wikieup on US 93, at about 75 miles. There's nothing between them, except some nice scenery and a couple of big cellphone towers Actually, there isn't even Nothing between them anymore (it's one of those towers). :)
Quote from: wxfree on March 25, 2020, 09:40:24 PM
The longest distance between gas stations in Texas appears to be 916 miles, from an Allsup's in Texline to a Stripes on South Padre Island.
ooh, you're smart
The longest I can think of in Massachusetts is an 8-mile gap on US-6 from the Mobil at US-6 and Main in Wellfleet...to the Citgo(?) station at US-6 and Standish in Truro.
Truro used to have a few gas stations along US-6, but that one mentioned above is the last one left. Even Punchy's and Sonny's don't have gas anymore. The one at 6 & 6A no longer exists at all (not even a building), the one on 6 just north of Truro Center Rd has been fully removed, the one just south of the dump I think is a flower retailer now (if still used commercially at all)...and I think there used to be one at Truro Center itself near Exit 106 until the 1980s.
Some gaps I was able to find in NC:
~14.5 miles on US 74 from Wesser to just outside Valleytown, NC.
~25.3 miles on NC 261/TN SR 143 from Bakersville to Roan Mountain, TN.
~25.8 miles on I-40 from JCT w/ US 276 to Hartford, TN.
~28.4 miles on NC 94 from Fairfield to Columbia.
~28.8 miles on US 64 from Hayesville to Franklin.
~32 miles on US 441 from Cherokee to Gatlinburg, TN.
~39.5 miles on US 264 from Engelhard to Manns Harbor.
Not very many significant gaps in SC.
Longest I was able to find with the time I had was ~29 miles from Jackson to Barnwell via SC 64 and 125. Goes through the Savannah River Site area.
Quote from: DJ Particle on March 26, 2020, 12:59:52 AM
The longest I can think of in Massachusetts is an 8-mile gap on US-6 from the Mobil at US-6 and Main in Wellfleet...to the Citgo(?) station at US-6 and Standish in Truro.
Truro used to have a few gas stations along US-6, but that one mentioned above is the last one left. Even Punchy's and Sonny's don't have gas anymore. The one at 6 & 6A no longer exists at all (not even a building), the one on 6 just north of Truro Center Rd has been fully removed, the one just south of the dump I think is a flower retailer now (if still used commercially at all)...and I think there used to be one at Truro Center itself near Exit 106 until the 1980s.
There are 30 miles between Exit 2 and Exit 3 on the Mass Pike. Even with a rest area, there must be a gap of more than 8 miles somewhere along that 30 mile stretch.
Quote from: 1 on March 26, 2020, 08:22:39 AMThere are 30 miles between Exit 2 and Exit 3 on the Mass Pike. Even with a rest area, there must be a gap of more than 8 miles somewhere along that 30 mile stretch.
Exit 2 is at mile 11, the Blandford plazas are at mile 29, and exit 3 is at mile 40. 18 miles from exit 2 to the Blandford plazas is the winner for MA.
Quote from: tman on March 24, 2020, 12:17:06 PM
Okay, some two-lane distances for MN (please correct me if they're not accurate; I used Google Maps and Gasbuddy)
Unsurprisingly, the majority were in the north/northwestern part of the state.
MN 89 - Grgyla to Redlake (56 miles)
MN 1 - Ely to Finland (56 miles)
MN 6 - Big Falls to Talmoon (46 miles)
MN 72 - Baudette to Waskish (41 miles)
MN 9 - Herman to Breckenridge (38 miles)
MN 9 - Ada to Crookston (35 miles)
US 59 - Morris to Barrett (24 miles)
MN 1 from Thief River Falls to Red Lake might have these beat, at 75 miles.
For NY, looking at Gas Buddy I think the longest distance on the freeway network is I-87 between exits 29 and 31 (23 miles). For surface routes, there are some pretty impressive distances in the Adirondacks, such as the 39 mile gap on NY 8 from Poland to Piseco, 42 mile gap on NY 8 from Speculator to Chestertown, or the entire 40 mile length of NY 28N.
If we can include Canada, there's a 209km (130mi) stretch between Hearst and Longlac in Northern Ontario on Highway 11 without any gas stations. I did the drive once and it's pretty desolate (nothing but trees)!
Quote from: Max Rockatansky on March 23, 2020, 04:23:28 PM
I would imagine I-40 or I-15 have the longest gaps. I-40 between Ludlow East to Fenner is pretty lengthy. If I recall correct there isn't any active service stations on I-15 between Barstow and Baker. I-5 has some long gaps on the West Side Freeway but I don't think many top 20 miles. I-10 might be up there too between Desert Center and Blythe.
On conventional roads in California it seems CA 62's advertised 100 miles is the legit article. I probably could string a couple low clearance roads in National Forests together that would probably beat 100 miles handily though.
Arizona has a couple lengthy freeway gas gaps. I want to say Vicksburg to Tonopah might be the longest on I-10.
22 miles between EXITS at Utica Ave and Twissleman Rd on I-5. The gas stations on or near the freeway are at CASR-41 "Kettleman City" and CASR-46 the "Lost Hills" exit are about 32 miles apart.
I forget whether there are any gas stations on the freeway between CASR-198 and CASR-152 (actually at CASR-33 "Santa Nella"). There may be something that gets you off the freeway and back on at CASR-165.
Quote from: index on March 26, 2020, 01:42:46 AM
Some gaps I was able to find in NC:
Brings to mind the Blue Ridge Parkway. Years ago, there were small c-stores with Amoco stations attached at regular intervals along the entire parkway, but all of those are gone, so it is not possible to measure distances that way. Here (https://www.blueridgeparkway.org/gas-availability/) is a list of parkway exit points where gas is available, so it gives an idea of the distances between opportunities for a fuel stop.
I drove the Natchez Trace Pkwy last year from Franklin TN to Tupelo MS. There are long stretches of the Parkway without a town let alone gas stations within 3 miles of the Parkway. In fact, the only town of consequence that I found was Collinwood TN with 3 gas stations.
Hohenwald TN (Tennessee 20 and US 412) to Collinwood TN (Tennessee 13) is 38 miles. Next gas was 1 mile east of the Trace on Alabama 20 west of Florence, AL. 22 miles. 18 miles to Cherokee AL (US 72). 21 miles to Tishomingo MS (MS 25). 36 miles to Saltillo MS (MS 363).
Quote from: michravera on March 27, 2020, 03:41:27 AM
Quote from: Max Rockatansky on March 23, 2020, 04:23:28 PM
I would imagine I-40 or I-15 have the longest gaps. I-40 between Ludlow East to Fenner is pretty lengthy. If I recall correct there isn't any active service stations on I-15 between Barstow and Baker. I-5 has some long gaps on the West Side Freeway but I don't think many top 20 miles. I-10 might be up there too between Desert Center and Blythe.
On conventional roads in California it seems CA 62's advertised 100 miles is the legit article. I probably could string a couple low clearance roads in National Forests together that would probably beat 100 miles handily though.
Arizona has a couple lengthy freeway gas gaps. I want to say Vicksburg to Tonopah might be the longest on I-10.
22 miles between EXITS at Utica Ave and Twissleman Rd on I-5. The gas stations on or near the freeway are at CASR-41 "Kettleman City" and CASR-46 the "Lost Hills" exit are about 32 miles apart.
I forget whether there are any gas stations on the freeway between CASR-198 and CASR-152 (actually at CASR-33 "Santa Nella"). There may be something that gets you off the freeway and back on at CASR-165.
Between CA-198 (Exit 334) and CA-33 (Exit 407), there are gas stations at exit 368 (actually multiple at that exit), exit 385, and exit 391
I remember my 2009 trip from El Paso to Carlsbad Caverns and once you get past the last gas station going east on US 62/180, the next one is Whites City, NM, at the entrance to Carlsbad Caverns NP. It says 149 miles from El Paso to Whites City, but it's less than that. I tried finding the last gas station on US 62/180, but couldn't figure out where it was.
Quote from: ftballfan on March 27, 2020, 04:11:44 PM
Quote from: michravera on March 27, 2020, 03:41:27 AM
Quote from: Max Rockatansky on March 23, 2020, 04:23:28 PM
I would imagine I-40 or I-15 have the longest gaps. I-40 between Ludlow East to Fenner is pretty lengthy. If I recall correct there isn't any active service stations on I-15 between Barstow and Baker. I-5 has some long gaps on the West Side Freeway but I don't think many top 20 miles. I-10 might be up there too between Desert Center and Blythe.
On conventional roads in California it seems CA 62's advertised 100 miles is the legit article. I probably could string a couple low clearance roads in National Forests together that would probably beat 100 miles handily though.
Arizona has a couple lengthy freeway gas gaps. I want to say Vicksburg to Tonopah might be the longest on I-10.
22 miles between EXITS at Utica Ave and Twissleman Rd on I-5. The gas stations on or near the freeway are at CASR-41 "Kettleman City" and CASR-46 the "Lost Hills" exit are about 32 miles apart.
I forget whether there are any gas stations on the freeway between CASR-198 and CASR-152 (actually at CASR-33 "Santa Nella"). There may be something that gets you off the freeway and back on at CASR-165.
Between CA-198 (Exit 334) and CA-33 (Exit 407), there are gas stations at exit 368 (actually multiple at that exit), exit 385, and exit 391
So, it's 34 miles between CASR-198 and Panoche Rd.?
Quote from: michravera on March 28, 2020, 12:49:50 AM
Quote from: ftballfan on March 27, 2020, 04:11:44 PM
Quote from: michravera on March 27, 2020, 03:41:27 AM
Quote from: Max Rockatansky on March 23, 2020, 04:23:28 PM
I would imagine I-40 or I-15 have the longest gaps. I-40 between Ludlow East to Fenner is pretty lengthy. If I recall correct there isn't any active service stations on I-15 between Barstow and Baker. I-5 has some long gaps on the West Side Freeway but I don't think many top 20 miles. I-10 might be up there too between Desert Center and Blythe.
On conventional roads in California it seems CA 62's advertised 100 miles is the legit article. I probably could string a couple low clearance roads in National Forests together that would probably beat 100 miles handily though.
Arizona has a couple lengthy freeway gas gaps. I want to say Vicksburg to Tonopah might be the longest on I-10.
22 miles between EXITS at Utica Ave and Twissleman Rd on I-5. The gas stations on or near the freeway are at CASR-41 "Kettleman City" and CASR-46 the "Lost Hills" exit are about 32 miles apart.
I forget whether there are any gas stations on the freeway between CASR-198 and CASR-152 (actually at CASR-33 "Santa Nella"). There may be something that gets you off the freeway and back on at CASR-165.
Between CA-198 (Exit 334) and CA-33 (Exit 407), there are gas stations at exit 368 (actually multiple at that exit), exit 385, and exit 391
So, it's 34 miles between CASR-198 and Panoche Rd.?
Yes, and I always found it odd Panoche Road has the gas stations when County Route J1 is on Little Panoche Road. Granted Panoche Road was for a brief time signed as CA 180 in the 1930s and was intended to be fleshed out to a real State Highway.
Nebraska is somewhat more impressive, not that it's too surprising. North-central/western Nebraska seems exceptionally desolate, more than most people might guess - nearly as much so as parts of the desert, IMHO. There are counties out there with just a couple hundred people. (Four of the ten least populated counties in the US are in Nebraska.) I drove through on NE 2/92 last fall, and made it around a half hour or so without seeing another car or human being. My car got one AM station, and one FM station, both public radio.
For Nebraska, I get:
74 miles between Mullen and Valentine (NE 97, which is shown as a "secondary highway" in the Rand McNally)
67 miles between Hyannis and Merriman (NE 61)
65 miles between Thedford and Valentine (US 83)
On I-80: 30 miles between Chappell exit and Sidney exit (you have to go into town in Chappell)
21 miles between Ogalalla and Paxton exits
20 miles between US 281 and NE 14
Anyone know what the longest in Alaska is? Probably pretty long.
Quote from: Roadgeekteen on April 06, 2020, 06:13:43 PM
Anyone know what the longest in Alaska is? Probably pretty long.
240 miles (https://www.aaroads.com/forum/index.php?topic=26599.msg2486272#msg2486272), longest in the U.S. (This is only for gas stations you can drive to -- you might get a higher number starting from communities like Utqiagvik, Kotzebue, or Yakutat with no road connections to each other or to any other communities.)
For Illinois, I offer the 22 miles between exits 54 and 76 on I-88. There might be a longer gap somewhere on the roads of Forgottonia, but I haven't been able to find one.
My guess for Oregon (sticking to reasonable routings and state highways) is if you're heading SE out of Burns towards Nevada on OR-78 and US-95, you won't hit a gas station until McDermott in 147 miles*. If you instead go north on US-95, it's not much better at 137 miles from Burns to Jordan Valley.
Not just that direction though, all of Eastern Oregon (outside the I-84 corridor) is very remote and gas is sparse. Go in any direction from Burns and your gas options are limited. Don't leave that town without at least half a tank of gas (depending on your vehicle of course, just be aware of the situation). OR-78 is simply the longest said stretch. US-20 from Buchanan to Vale is 90 miles, Riley to Bend is 100 miles, Burns to John Day is 70 miles, and Riley to Lakeview is 118 miles.
*EDIT: It appears there is some gas available in Crane, OR, but only from 7:00 AM to 7:30 PM (you need to pay in the store which closes at 7:30). Crane to McDermitt is still 118 miles though.
For interstates in OR, it would be I-84 from Ontario to Baker City (70 miles).
Despite my location, I honestly have no idea what it might be in Idaho (EDIT: US-12 was mentioned earlier, that sounds likely).
PA might be PA 44 between Waterville and Coudersport -- there was a lodge/store at Carter Camp, but that appears to be closed now. This would be approximately 59 miles between stations.
Quote from: doorknob60 on April 07, 2020, 04:33:32 PM
My guess for Oregon (sticking to reasonable routings and state highways) is if you're heading SE out of Burns towards Nevada on OR-78 and US-95, you won't hit a gas station until McDermott in 147 miles*. If you instead go north on US-95, it's not much better at 137 miles from Burns to Jordan Valley.
Not just that direction though, all of Eastern Oregon (outside the I-84 corridor) is very remote and gas is sparse. Go in any direction from Burns and your gas options are limited. Don't leave that town without at least half a tank of gas (depending on your vehicle of course, just be aware of the situation). OR-78 is simply the longest said stretch. US-20 from Buchanan to Vale is 90 miles, Riley to Bend is 100 miles, Burns to John Day is 70 miles, and Riley to Lakeview is 118 miles.
*EDIT: It appears there is some gas available in Crane, OR, but only from 7:00 AM to 7:30 PM (you need to pay in the store which closes at 7:30). Crane to McDermitt is still 118 miles though.
For interstates in OR, it would be I-84 from Ontario to Baker City (70 miles).
Despite my location, I honestly have no idea what it might be in Idaho (EDIT: US-12 was mentioned earlier, that sounds likely).
Harper appears to have a gas station, unless that one shut down recently. Buchanan to Harper is still 68 miles. GSV in 2018 shows that there are signs along WB US-20 just west of Harper as well as EB US-20 just east of Buchanan that say "Next Gas 68 miles". As of GSV's pass through there in 2012, Seneca appears to have had a station then (45 miles from Burns and 25 miles from John Day).
GSV shows abandoned gas stations at these areas:
The junction of US-95/OR-78 (63 miles from Crane, 55 miles from McDermitt, 46 miles from Jordan Valley)
Valley Falls (90 miles from Riley and 22 miles from Lakeview)
Hampton (60 miles from Bend, 21 miles from Brothers, 41 miles from Riley)
Brothers (39 miles from Bend, 21 miles from Hampton, 62 miles from Riley)
Also, I'm very surprised Huntington (population around 400) doesn't appear to have a gas station at all!
Quote from: ftballfan on April 13, 2020, 10:26:17 AM
Quote from: doorknob60 on April 07, 2020, 04:33:32 PM
My guess for Oregon (sticking to reasonable routings and state highways) is if you're heading SE out of Burns towards Nevada on OR-78 and US-95, you won't hit a gas station until McDermott in 147 miles*. If you instead go north on US-95, it's not much better at 137 miles from Burns to Jordan Valley.
Not just that direction though, all of Eastern Oregon (outside the I-84 corridor) is very remote and gas is sparse. Go in any direction from Burns and your gas options are limited. Don't leave that town without at least half a tank of gas (depending on your vehicle of course, just be aware of the situation). OR-78 is simply the longest said stretch. US-20 from Buchanan to Vale is 90 miles, Riley to Bend is 100 miles, Burns to John Day is 70 miles, and Riley to Lakeview is 118 miles.
*EDIT: It appears there is some gas available in Crane, OR, but only from 7:00 AM to 7:30 PM (you need to pay in the store which closes at 7:30). Crane to McDermitt is still 118 miles though.
For interstates in OR, it would be I-84 from Ontario to Baker City (70 miles).
Despite my location, I honestly have no idea what it might be in Idaho (EDIT: US-12 was mentioned earlier, that sounds likely).
Harper appears to have a gas station, unless that one shut down recently. Buchanan to Harper is still 68 miles. GSV in 2018 shows that there are signs along WB US-20 just west of Harper as well as EB US-20 just east of Buchanan that say "Next Gas 68 miles". As of GSV's pass through there in 2012, Seneca appears to have had a station then (45 miles from Burns and 25 miles from John Day).
GSV shows abandoned gas stations at these areas:
The junction of US-95/OR-78 (63 miles from Crane, 55 miles from McDermitt, 46 miles from Jordan Valley)
Valley Falls (90 miles from Riley and 22 miles from Lakeview)
Hampton (60 miles from Bend, 21 miles from Brothers, 41 miles from Riley)
Brothers (39 miles from Bend, 21 miles from Hampton, 62 miles from Riley)
Also, I'm very surprised Huntington (population around 400) doesn't appear to have a gas station at all!
Yeah you're right about Harper, my bad. For some reason I was picturing that gas station as being right near Vale. And yes, a lot of abandoned gas stations around rural Oregon. It took me a while to realize the big gap in gas between Bend and Riley (and realistically you'd want to gas up in Burns/Hines instead), since when I first drove through Hampton and Brothers, I didn't click that the gas stations there were abandoned. But they definitely are. There's another abandoned gas station in Millican (between Bend and Brothers). At least there's a rest area in Brothers, a common stop for me.