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Your car has been designed to deal with gas as low as 87 Octane. My car is N/A and I really feel no need to use anything other than 87. And I like to drive fast. I have noticed no significant performance or economy advantage from higher octane fuel experiments I have performed with my '98 S70. Turbo-charged engines probably benefit more from higher octane fuel, but 92 seems enough to me. I would not spend the money on octane boosters or even high octane gas. I do run a fuel system cleaner now and again to counteract generally lower levels of detergents in regular grade gas. I also perform "Italian Tuneup" (combines utility and pleasure) every day on the way to work, so I am not really worried about gummed up valves. My car runs great never had a lawn mower syndrome and the milage is ok considering my style of driving.
Cheers.
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