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Does your 2005 BMW 530i really need premium gas?

According to the 2005 BMW 530i Owner's Manual:

"BMW recommends the use of premium unleaded gasoline with an octane rating of 91 or higher. If the octane rating of the gasoline available is lower than 91, a slight power or gas mileage reduction may be noted. Do not use leaded gasoline or gasoline containing methanol".