Being a full time RV'er I find that most fuel stations right off of the interstate exits are higher than those further off the highway. While towing I generally use Flying-J or Pilot with the RV Frequent Fueler card. I am at about .05 off per gallon at this point, but it convenient they have RV lanes at Flying-J's (as long as some ******** in a 4 wheeler isn't clogging the RV lane) and when I need DEF, I go thru the truck lanes. When I am not towing, I find no need to go to a Flying-J unless I am in need of fuel and they are the only thing around.