hmmmmmm Ive never noticed any one particular brand to be any better than any other, with the exception of back in the 70's I used to run Shell gas almost exclusively, because I found its performance to be so much better. ( Couldnt get Sonoco in California). Today, the gas mixtures are combined by govt regulations for specific parts of the US. My Brother In Law owns a Connico bulk plant and he actually tanks gasoline to just about every brand label you can think of in the area, including the Amico and Chevron stations in the area. So in a word, at least in this area, it all comes from the same well.