MAKE YOUR OWN OCTANE BOOSTER FOR LESS THAN £3 A BOTTLE!!!
How to make your own octane booster (this is the basic formula of one of the popular octane booster products). To make eight 16 ounce bottles (160 oz = 1 UK gal):
125 fl oz of Toluene for octane boost
31 fl oz of mineral spirits (cleaning agent)
4 fl oz of transmission fluid (lubricating agent)
This product is advertised as "octane booster with cleaning agent *and* lubricating agent!".
Diesel fuel or kerosene can be substituted for mineral spirits and light turbine oil can be substituted for transmission fluid. Color can be added with petroleum dyes.
Who want to put that in a Crossfire - might be good in my old Toyota Pickup though.