Imo gas is gas in the average cars for sale, my lawnmower engine in my golf cart runs just fine on any gas I buy reguardless of brands Or octane. Back in the old days when I had triple Duce GTX I looked for the highest octane gas I could find which was good old Ethel. When I wanted to really to fast I filled up with airplane gas. If you feel Shell or any other gas station gas don't have enough additives already? there are plenty for sale, kind like insurance, just in case?
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