Loves and pilot, flying j. There are few stops for fuel as they have certain stops and you can't fuel at every loves, pilot, and flying j.
Primarily the bulk of the fuel network is select Love's, Pilots, and Flying J's. There's also a few select Kwik Trip's. During the orientation process you would be provided with a J&R Schugel Fuel Guide that would list the locations and fueling limits (if applicable). I prefer the Pilots and Flying J's because it's a lot easier to get a parking spot.
Jeff and sandy are correct we have a very good network of truck stops that we can fuel. I have been working at J&R for almost 8 years now and I never go by at least a few of our stops. And if you need fuel all you have to do is call them and you can get emergency fuel at any place that accepts comdata
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