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Registered
Join Date: Mar 2007
Location: Santa Barbara, CA
Posts: 509
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As mentioned already, it's the additives or the amount of additives which differentiate gasoline. In the early 1990's the federal government mandated that refiners have a minimum amount of additives. Generally speaking, many refiner brands have 2-3 times this level of additive.They may have other unique qualities as well. Interestingly, Costco has 5 times this rate and they blend the additives at their stores. Look for the stainless steel box near their pumps. This way they can buy gasoline from any refiner they choose and still blend to their desired additive rate.
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Hugh Lindberg
1972 911
1970 Alfa Romeo 1300 GT Junior
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