Basically gas is gas and this is why. We'll look at San Diego for instance. Years ago when Shell called their long beach refiner and requested 100k gallons of regular be sent down via the one and only pipeline to San Diego the refinery put there’s in and then a pig ( a plug)to separate their gas from Chevrons gas. Toady it doesn’t work like that anymore due to the pigs being a big hassle which increases money. Now when Shell in san Diego calls up the refinery, they just pump the basic regular in, then Chevron pumps their basic regular in, then Union 76 pumps their diesel in, all in the same pipeline going down to san Diego. Once it's there they try there best to get Shells to Shell Chevrons to Chevron etc. etc. Now your wondering about the gas that was right up against the diesel, they pull that out and the nasty stuff where it mixed on the way down is sold to the ships for fuel. Now what makes them all different you ask, the sauce each of them has invented to make it pass Cali smog laws, clean your engine, and remove carbon deposits. This is what makes or breaks a gas company, besides TV commercials which can program anyone to buy anything. As far as I can tell today Chevron has the best sauce. I see a big difference in power when I tow, and when I replace my plugs. Arco is death to valves, guides, and pistons due to the incredible amount of carbon deposits it leaves in your combustion chamber. You get what you pay for. I have found that buying low grade gas also reduces my fuel economy, so I buy premium and get far superior economy.
Rick
