[Lazarus]

Originally Posted by Christ

There are similar claims with Xylene and Toluene... both of which have octane levels of race fuel. (117 and 114, respectively).

I've personally added 1 gallon of Xylol to my 87 octane fuel mixture, so by simple averaging:

87 octane x 11 gallons = 957
117 octane x 1 gallon = 117

957 +117 = 1074

1074/12 gallons = 89.5 average octane rating.

The effect was like using mid-grade gas in my car. I got no better or worse fuel mileage. I did notice that it cleaned the intake runners in the head of gook though, when I changed the intake manifold.

I never had a chance to try 2 gallons, which would have given me

87 x 10 = 870
117 x 2 = 234

1104/12 = 92 octane.

I contend without experiment that it would have done nothing, however, for fuel economy, as higher octane fuel does nothing unless you tune for it.

Test Vehicle was a 1989 Honda Civic DX, 1.5 liter, "new" engine (20-30,000 miles) average driving method (3k shift, 70-75 MPH highway@3200-3800 RPM 5th gear), average spring/summer weather, average trip length = 28 miles or so (closest store is 10, work was 35 one way, "everything" was 20 or so.)

Before anyone attempts to flame the use of explosive solvents in your fuel - Gasoline contains Xylol and Toluene already. Adding more won't screw up your engine, and is only dangerous if not handled correctly.

I've got a home brew to that works well for me. Funny things about cars none are the same with varing degrees of defects that make the FE game interesting.