indianapolis and mid ohio
Alas, I can graduate from mere lurker, to actual poster!
I'm ususally not much of a sandwhich girl, but assuming you're heading north on 75 through Lima, stop in and get a Kewpee hamburger for lunch. Make sure to go to the downtown location, as you'd pass a different one on the way in before reaching downtown.
Kewpee has been a staple of Lima since 1928, in particular the downtown location, which is very diner-esque. It's been rumored that Dave Thomas searched the country high and low when looking to develop Wendy's, and that he based it off Kewpee. This can be seen in their square hamburgers, malts, and chili.
Great hamburgers, but be sure to save some room for sugar cream, or lemon crunch pie!