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Expensive, high octane fuel DOES NOT make additional power. It is simply necessary when you have higher compression
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Not true... a friend of mine just dynoed a spec miata with a STOCK miata motor on the chassis dyno. First they dynoed with 91 octane pump gas, and then drained the tank and ran race gas avaiable at the track.
The motor made 3 rwhp more, no other changes but the gas!
David