Quote:
Originally Posted by Adam Ef
Using the Fuelly site, my MPG results always seem better after filling up with premium fuel. Not an exact science though as it may be partly coincidence. If I work out the extra cost vs MPG the extra cost of the fuel per litre always seems to pay for itself.
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This is what I found on cars with an ECU smart enough to adjust spark timing, modern car ECU will back off ( retard ) timing if knock detector gets triggered, this can happen with lower octane, and the later spark means less power, so more throttle for same speed. Do not know if bikes have knock sensors though.