Chevron! If I cannot get Chevron, either 76, Valero or Shell. A colleauge of mine used to work for Chevron so he had quite some knowledge about Techron and its effect on engines (he worked in the research department, now retired at the age of 38, on Hawaii...). After listening to him, I got convinced Chevron has one of the best gas mixtures out there. And unlike Shell (who only adds their stuff to the already most expensive gas), Techron is used on all grades of Chevron's gas.