110 octane at the pump
If you want to boost your octane toss in some Xylene (117 octane) with your unleaded fuel and 1 ounce of Marvel Mystery Oil per gallon of Xylene. You can get it at your local paint store. 5 gallons is about $40.
7 gallons of 92 octane
3 gallons of Xylene (117)
3 ounces of MMO
yields 100 octane
Adding more than 30% Xylene will make the car have difficult cold starting characteristics. The Torco additive is basically Xylene and a few other chemicals. However it only raises your octane level from 92 to 92.3 for example. Waste of money IMO. You need some volume to really increase the octane your fuel has.
Last edited by gnx7; Apr 9, 2005 at 12:10 PM.
Paul

I usually run 109 unleaded but one day at the track I misjudged the amount of fuel that I had and ended up putting about 3 gallons of 110 in the car. I didn't think just 3 gallons in the scheme of things would hurt.
I only got about 10 miles from the track on my way home before the car developed a little part throttle stumble. By the time I got home the car would buck and stumble all over the place. I managed to foul the oxygen sensors in a matter of 20 miles.
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