Originally Posted by buschy
I dont see any hard evidence on that anywhere.. matter a fact I know a couple people who had broke down after fueling up with "top tier" gas.. two of them from Shell, lol.. and it was bad fuel..
so who knows. I have never had any problem and I use sams and costco alot, but I also use race track and whatever else is around.
The gasoline is generally the same. A 93 octane from Shell could come from the same refinery/tank farm as the 93 Octane from Exxon across the street. The difference, as BCA mentioned, is the proprietary additive that they inject. They inject it at the truck rack as the truck is filling its tank. Most of these additives have the same properties, just with slightly different ratios of chemicals.
So, not to knock truckers, but any time a trucker pulls in to fill up there tanker, there are a number of quality control measures that they are expected to take. When they take them, you're generally guaranteed a good product. When they don't, its hit or miss. Some are expected to do some pretty complicated math to get the ratios right (generally for ethanol blending). There a lot of little things that can go wrong, and unfortunately you don't usually find out until its already offloaded in to storage at a station and delivered to a customer, regardless of whether its from Costco or Shell.
As for Ethanol... yeah, I'm not a fan either.
Um, saw a Jet Black E92 this morning. It was in my garage. /endthreadjack.