Originally Posted by Frankenduster
Originally Posted by calrobb2000
hi
oce you try it you will never go back !

all i have used for last 4 years , no methonal to ruin your gaskets / seals .


you can advance your timing app 4 deg for better performance .

no down side !


Uhh, if an engine makes peak performance with 91 octane and 35 degrees of ignition timing, running higher octane and more spark timing will not improve anything.
People have the false impression that higher octane will automatically make your car faster. That is only true if the engine is modified with higher compression and if the gas they buy at the gas station does not have enough octane to allow a decent timing curve.
People with a 10 to 1 engine are not likely to gain anything running 100 octane fuel.



Exactly this. Additionally, its has different density. Meaning, even if you DID need higher octane to avoid detonation, you would like have to re-jet for optimum AF ratio.