So for high
performance applications we can use very low octane fuel. We can use less
timing advance than a piston engine, 27degrees for racing about 20 for
anything else. We can run over lean or over rich
with little effect other than slightly reduced power. Low octane fuel has
slightly more energy in it than high octane fuel.

Al Gietzen wrote:

It would seem that one clear message from this excellent disertation is that
we do not want to fill with 100LL at the friendly FBO.  Hopefully we'll
start seeing the new 82U show up where they don't have mogas.

Al

charles.harbert wrote:

Al, that's fine for you, but how about us turbo guys? Mazda recommends premium
fuel for turbo engines, but how much octane do we need (100, 92, 87, etc)? If we
guess low, we break the apex seals-ouch! Also, at higher altitudes, mogas is a
problem due to vapor pressure. I'd be interested to know what works best for
aircraft.

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