Originally Posted by 11Stryker
87 Octane is what I use and what Yami recommends. Just pissing away money with anything higher. Also I put alittle seafoam in on occasion!
Here is some good info for example of what the main performance of different level octane is for.
Octane Quality and Vehicle Octane Requirement
Gasolines are most commonly rated based on their
Antiknock Index (AKI), a measure of octane quality. The AKI
is a measure of a fuel’s ability to resist engine knock (ping).
The AKI of a motor fuel is the average of the Research Octane
Number (RON) and Motor Octane Number (MON) as determined by the formula (R+M)/2. This is also the number
displayed on the black and yellow octane decal posted on the
gasoline pump. Optimum performance and fuel economy is
achieved when the AKI of a fuel is adequate for the engine in
which it is combusted. There is no advantage in using
gasoline of a higher AKI than the engine requires to operate
The RON and MON of fuels are measured by recognized
laboratory engine test methods. Results of these tests may
generally be translated into approximate field performance.
In general, the RON affects low to medium speed knock
and engine run-on or dieseling. If the Research Octane
Number is too low, the driver could experience low speed
knock and engine run-on after the engine is shut off.
The MON affects high speed and part-throttle knock. If
the Motor Octane Number is too low, the driver could experience
engine knock during periods of power acceleration such
as passing vehicles or climbing hills.
The antiknock performance of a fuel, in some vehicles,
may be best represented by the RON, while in others it may
relate best to the MON. Extensive studies indicate that, on
balance, gasoline antiknock performance is best related to
the average of the Research and Motor Octane Numbers, or
(R+M)/2.This formula is continuously reviewed for its accuracy
in predicting gasoline performance in new automobiles,
and is, in fact, currently being studied again because some
smaller displacement engines that are prevalent today respond
to octane differently.
The RON of a fuel is typically 8 to 10 numbers higher
than the MON. For instance, an 87 octane gasoline typically
has a MON of 82 and a RON of 92.
If you want to read more