Originally Posted by mmartinez
Just FYI a mechanic friends says Chevron is the best.
I haul / deliver gasoline for a living. I load the truck, drive to the gas station and transfer the gasoline from my truck to the station tanks. At the terminal where I usually load my truck, there are several brands available. There is Sunoco, Mobil, Citgo, Hess, Gulf and "unbranded". When I load my truck, regardless of which brand I choose, IT COMES FROM THE SAME TANK!!!! Which was loaded from the same barge or ship, which came from a refinery somewhere that was determined by location, quantity of product, price and availability.
The difference in the various brands is the additive that is injected at the time of loading (less than 10 gallons in a load of 9000 gallons). The terminal where I usually load my truck has TWO different additive tanks available. I'll leave it to you to figure out which brands are the same.
There are several terminals in my area where I load. Each one has several brands available. In every case, the gasoline comes from the same tank! With ONE exception, I know of NO terminals that load only one brand of gasoline and I know of NO terminal where the brands are separated into different tanks. That one exception WAS for Amoco (now BP) premium. That gasoline had it's own tank at any terminal where it could be loaded. Since I don't deliver BP, I don't know if this is still true.
Yes, there may be slight differences in the quality of gasoline at different stations. However, the difference is due to the refinery that produced the product, usually because of the quality of the crude, rather than because it's Chevron, or Conoco, or Shell or whatever. One brand is not consistantly better than another.
Just remember, all gasoline HAS to meet certain minimum requirements. When a ship comes to the terminal to be unloaded, a sample of the product is taken and chemically analyzed before it can be unloaded. If it fails to meet the standards, the load is rejected. No company intentionally sells "bad" gasoline.
What happens after the station gets it is another matter.