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Originally Posted by jhbodle
If you want to get the specified BMW ratings for horsepower, torque, 0-62mph etc then you should use 98 octane for the 6 cylinder engines and 95 octane for the 4 cylinder petrol (in the UK). That's the petrol BMW use to get their performance figures according to their brochures.
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I'm not so sure about this. To the best of my knowledge you can't even get fuel with that high of an octane rating in the U.S. So it would be silly if not illegal for BMW to claim performance figures that are only achievable from that kind of fuel for a U.S. car.
This isn't a hard question to answer. Any car's owner's manual I've seen so far mentions the minimum ideal octane rating of the fuel you should use. If one of the owner's could look it up in theirs, that should settle it. I'm talking about owners of U.S. vehicles.