100 Octane Unleaded Fuel

[JoeP]

Brian:   I used to work in gasoline blending as a refinery engineer, and one octane point was hard.  Seven is impossible when you start from pump gas.  Refiners start with raw components, so they have the option of leaving out stuff that lower the average.  Raising the average is hard.      

1) Do not try to raise the Octane of 93 pump gasoline.  Toluene won't get you there.  Straight toluene is only 103 Octane.  Your final fuel would need to be 70% toluene to hit the theoretical octane rating, and it probably won't blend ideally, so you would need more.  Something that rich in one component would be very bad gasoline.  I have never seen one of those little-bottle octane gimmicks that comes even close to its claims.  Back in the day, MTBE was a better choice at 110 octane, but you can't find it any more.

2) If you no longer have catalytic converters, blending motor fuel with AvGas will work, but it is stone illegal.

3) I would use Sunoco 100 octane pump gas.  Unfortunately, the number of stations drops every year.  Most of the Pennsylvania stations are out in the boonies where people still build their own performance cars:

   http://www.sunocoinc.com/site/Consumer/RaceFuels/260GT100Locations

Joe P.