Fuel Requirements

[bone crusher]

Yup, definitely saw an improvement in mileage per tank as the miles were put on the engine. I pretty much stick to 89 and every so often 91 octane now. I do feel at least "the perception" of better performance with the 89-91 octane. I cannot really confirm improved MPG, but the machine does seem to run better with the better grades of fuel. I do not put in any additives either.

Yeah...I think most sources will say that it's a psychological effect more than a true mechanical one...

I use 87 and my bike is fine with it...when running 93, I really didn't see a change, except for an additional 20+ cents/gallon.

I do have numbers on my old BMW...I get about 2mpg higher with 89, even though the old '92 only 'needed' 87...funny thing is that with 93, it runs the same as with the 87....odd...I guess with age, it gets a little pickier. Who knows...