I use the Good Sam card at Flying J and Pilot. I have been across the US and back 3 times in the past 2 years and have always found those stations to be the same or cheaper than others in the area. You must remember to fill up when close to town and the bigger the town the better. If you wait till you are 30 miles out you will pay more. I also use a credit card that has 5% cash back at gas stations. I also like that I get a discount on coffee and dump station and propane at those stations and many have separate over night parking for RV's. It may be a bit noisy but I always feel safe and after driving all day I have no problem falling asleep.
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