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the Speedchannel just had a test concerning fuel octane......they ran a Porsche on a dyno.......with 94 octane then 89 octane......the car lost 5 hp and 10 ftlbs of torque with the cheap stuff........thats reason enough for me...



That's because the Porsche has a closed loop fuel injection system. The knock sensor is telling the ECM to retard timing and adjust fuel delivery because the high compression engine is knocking on the lower octane...result is less HP for the Porsche.

Your Bonne's engine has no way of determining knock, runs on a fixed ignition curve, and can not modify fuel delivery in any way. Lower octane is not going to rob you of any performance UNLESS your engine is knocking (pinging, predetonating, whatever...). So, I stand by my preference to run the lowest octane (most effecient burning) fuel that doesn't cause knocking.

Todd Richmond Grapevine, TX USA '78 R80 /7 '06 FJR1300A