Ashland, Ohio is home to Grandpa's Cheese Barn. It is easily accessed from Interstate 71
Grandpa's Cheese Barn is an awesome place to stop. They sell more than just cheese and you can sample most of the products. It is one of the few places in Ohio that sells cheese curds. Not stopping at Grandpa's Cheese Barn on previous trips is something I regret. This sort of side trip is one of the best arguments for driving instead of taking the bus.
There is a Marathon gas station Ashland. It has diesel fuel, but you have to get it from a one-armed warrior pump.