RE: Long New York Highways
I'm always one to recommend my favortie diners. There are several along I-90, aka the NY Thruway, which are easy to get to. For some I won't give directions, it's easier to ask the toll collector.
Here are several in more or less east to west order:
The Empire Diner, Herkimer, NY less than a mile from the Herkimer Exit.
Canastota NY, The Canastota Dineraunt (if it's still open, it was in March) about 3 minutes from the exit of the same name.
Syracuse, NY, Doc's Little Gem Diner. Take the exit for I-481. Follow 481 a short distance south, get on I-690 West, follow 690 mostly thru the city till you see the exits for Spencer St or Bear St. Doc's is close by. You can also get right back on 690 West which leads right back to I-90.
Waterloo, NY, Connie's Diner. Take the Waterloo/Seneca Falls Exit, go south on NY 414 till you come to US 20 (5 miles or so) Turn right on US 20, Connie's will be on your right after about a mile. No need to backtrack here either, go a short distance on US 20 and turn right on NY 96, it will take you right back to I-90 one exit further west.
Rockester, NY The Highland Park Diner, 900 block of South Clinton Ave @ Goodman St. More complicated to get to and about 10 miles from I-90. Best to use mapquest or ask at toll booth.
Good eating and have a safe trip!