FMCA I believe still has an agreenment with Flying J, which we try to use when availalbe. I just pull into the big rig area and let the fuel desk I am an RV, paying cash with a Flying J card. Sometimes I have to go in first, but I get the cash price plus a discount from the fuel based on the card. I see lots of regular filling stations with cheaper prices, but getting my 40' rig w/toad into some of those would be a job, so I just eat the higher price and use them. Luv's, Travel Centers of America, and other large fueling stations have a rewards program, so you can use the one of your choice.
Monty & Janet - 2007 Alpine APEX 40 MDTS
S/N - 75715 - Retired - Master Certified RV Tech