FYI, In the late 80's I was called to help investigate causes behind sudden 'inventory problems' at over 100 mid west area BP stations. It was found that the fiberglass Underground Storage Tanks (UST's) had began to fail and were leaking. the cause for these failures was traced to the 'ethenol blended' gasoline that was being stored in them was 'corroding' the epoxy in the fiberglass tanks. It wasn't any help that the use of ethenol gave them a tax break and cost approx 30 cents per gallon less then gasoline. So I wasn't surprised that the fuel they were selling as 90% gas with 10% ethenol was in fact as much as 45% ethenol.

My point being that anyone can swindle you on the quality of fuel. I do belive that the major oil companies have a better track record then small unbranded stations though. Keep in mind that a major oil OWNED station has no choice of which terminal it can purchase it's fuel from, that is set by it's parent company. A privetily owned but major oil branded station has a little wiggle room.

That said, an UNBRANDED station is free to get the cheapest fuel it can find. Sometimes it gets it's fule from the terminal of a major, sometimes it get it from, well, they and you get what you pay for.

How much do you like your truck? Enough to buy junk for a couple pennies a gallon?

BTW, octane rating is NOT a measure of fuel quality.