Well, it isn't scientific, but I ran my Rabbit and Lori's Golf on Super Shell, that's RU-2000 (92 octane) and I got 209,000 miles on the original bottom end of the Rabbit and 120,000 on the head VW replaced for leaking seals. Lori's car went 117,000 with no problems in the engine what so ever. Cost of ownership, per mile, of even old busses, isn't solely gas. The 87 octane stuff, IMHO, is a commodity product blended for a low price. The 89 and 92 octane products are less prone to detonation, have cleanlyness promoting additives, etc. I figure gasoline is like most things- if there's a modest difference in price, the manufacturer is very often selling a markedly better product for the small increment. This sure holds true for food (Compare cheap peanut butter to good stuff, or cheap vegetables to good organics...). The bottom of any market is price driven, and the top is features and customer relations driven. VWs were never the cheapest cars to buy or to own, although they were arguably the best buy for many years. Bill
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