Sunday we were on I 64 in Indiana.  Pulled into the Flying J.  Diesel was advertised at 2.86 a gal  but after we pulled in a sign on the rv and car pumps said car diesel was 3.09.  Is this a common practice now?

You must have stopped at the same one we stopped at in Indiana.The lady inside said the big sign was for truckers who pay their fuel taxes seperatly than the normal public.So the difference was fuel taxes.Told her I thought it was very a deceptive advertising ploy.In her defense she just works there and has to follow Corporate rules.I am thinking of lodging a complaint although with the Flying J/Pilot merger after bankruptsy I may not hear anything.That is NOT a standard practice with them as all other Flying J/ Pilot stores have honored my Frequent Filler card and sold me Diesel at the cash price.

Both Indiana and Oregon have this situation where they often advertise the truck driver diesel price when everyone else pays more. In Arizona they advertise the car price since vehicles over 26,000 lbs pay 8 cents more per gallon. (Yes, many RVs that are over 26,000 lbs don't fess up and pay the 8 cents in Arizona.)

This is not just a Flying J thing. Most stations in Indiana do it. I never buy fuel in Indiana because I also think it's deception.

I've got a large enough tank and with just a little planning I can buy fuel in a neighboring state where you get it for the advertised price. 

Jim

We see the practice of advertising one price and charging another all over, for different reasons in different states. The most common is to charge more for credit or debit cards.

The difference in cash and credit prices is not close to the 25 or 26 cent difference between semi and car diesel

Yes, the truckers pay different taxes in Indiana and Oregon so they get a break for fuel prices since they already paid. The difference is sales tax in Indiana (6 to 7% I think) and 24 cents in Oregon. Plus at Flying J's (and some Pilots) right now you have to fuel at the car and RV islands to get the cash price with card. There is no discount for using the truck islands.

Thanks y'all for the warning. Heading up to Brown CO, IN in a few weeks. Will watch that with the diesel.