Charging extra on service for non-locally purchased RVs

Price discrimination occurs when a business charges a different price to different groups of consumers for the same good or service, for reasons not associated with costs.

If for instance Ford has their oil change special on for 20 bucks, and they then give a 10% discount if you bought you car there, they would be guilty. If you can prove you paid 10% more for the exact same service , you have a case. I don't care what wpo says.