Update - Diesel lane tips/advice

I rarely if ever see cheaper diesel at smaller stations aimed at autos. Maybe off the major interstate highways in the central and western US this is different. But at least from NY to FL on the east coast, up and down all the major routes including US 15, the truck stops are the same price cash as the smaller stations. The only thing I can think of is comparing the truck stop credit prices to the prices at smaller stations which are usually cash or credit. But I already know how to get the cash price at the bigger stops and use a rewards visa, so now I am at the same cost, sometimes a few pennies lower, plus the rewards of 4% on the purchase. Couple that with easier ingress/egress, and even without pump start its actually equal to the smaller stations where I have to go in anyway to pre-auth for more then the $75 limit is.