[Spridgets] Octane Averaging

Mark J Bradakis mark at bradakis.com
Tue Dec 4 19:24:15 MST 2012

Bob Spruck wrote:
> If I mix equal amounts of 110 and 100 octane race gas, will it average
> out to 105? 110 is too much, 100 is too little, 105 is just right in my
> 11:1 engine. Seems logical to me but I thought I better ask.

Actually it isn't quite linear.  It would be more like 4 gallons of 100 
and 2 of 110
would do it.  I thought I had a reference handy, can't seem to find it.


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