RE: Octane vs. MPG

["Jason Foster-Bey" <jasonfb@xxxxxxxxxxxxxxx>]

> Stan,
>
> Actually, I think it's the opposite. Lower octane gas will give you
> better mileage. High octane gas is needed in high compression engines so
> it won't ignite under pressure before the spark plug fires (pre-ignition
> or ping). So it really renders less energy than lower octane gas.

Uh, to be clear, high octane gas render more energy. Ignition of a highly
compressed air-gas mixture results in more energy than the ignition of a
less compressed mixture.

Regards,
Jason
'99 323i

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