^ And to expand on what kalvado said earlier, here where people say "i-90" they mean free 90. Not the Thruway. That's separate. Similarly, I-87 and the Northway are used somewhat interchangeably (but not completely... Northway is more common for NB, I-87 for SB), with the Thruway portion being separate (part of why I-87 and I-90 each having three sets of exit numbers doesn't confuse locals... nobody thinks of them as continuous routes). I can't say I've ever heard "I-85", though.
I have heard "route" around Rochester, but come to think of it, mainly among people who are boomers or older. Maybe it's generational. Or maybe it's because most of my living family is boomers. Hard to say. But just the number certainly is common too.