[Karl Bebout]

I came up with these formulas from a Turbo Buick Web Site. They did stress the need for a good respirator and caution since the fumes are carcenigens (sp)

Toulene with 92 octane gasoline
10%....94.2 octane
20%....96.4 octane
30%....98.6 octane

Xylene with 92 octane gasoline
10%,,,,,94.5 octane
20%.....97.0 octane
30%.....99.5 octane

Methyl-tertiary-butyl-ether (MTBE) with 92 octane gasoline
10%.....94.6 octane
20%.....97.2 octane
30%.....99.8 octane

The site also stresses that higher concentrates do not improve the ratings and may be hazardous to vehicle and/or operator.

I understand that these chemicals may be available at chemical suppliers or some paint supply stores. Sure beats paying $5-$10 for a can of booster that will only raise your octane rating 2/10ths or 3/10ths of one octane.