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1/2 right (archive)
[ Follow Ups ] [ 5-series (E34) Message Board ] [ Msg. Board FAQ ]
Posted by DRM on April 18, 2000 at 14:13:30:

In Reply to: I just heard a reason not to use higher octane... posted by Tim Collins on April 15, 2000 at 21:31:53:

It's not just additives. The premium fuel itself has less chemical energy per gallon than regular. There is absolutely no reason to use a higher octane than your engine demands.

Having said that, however, remember that if you have P-chipped the engine, then you probably NEED 91 octane to keep out of detonation conditions under hard acceleration. That's the price you pay for the higher performance. BMW compromises a bit on performance to allow use of mid-grade fuel. All the chippers do is reset the numbers to take advantage of the premium fuel.

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