"Guy King" wrote in message
...
The message
from "vortex2" contains these
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I'm nearly convinced. Is there any negative side to running higher
octane
fuel in your engine?

It costs more! Not all engines are capable of making the best of higher
octane fuel - in fact, very few are.

Try asking in uk.rec.cars.maintenance instead.

My Dad got more MPG from 99 Octane in his old Sierra.