reply to m8trix
Re: costco gas All gas in the area comes from the same source. The only difference is the detergents added (stabalizers don't matter much if the station goes through gas in a normal fashion).
I agree 100% with Cylon... TTL gas is all a marketing gimick. There is absolutly no evidence that non-TTG is not as good as TTL. non-TTL could even be better (as the organization does not even test non-TTL gas).
If a person has a preference, great. Stick with it. I've yet to hear of vehicle having issues with a certain brand of gas.