optimax

[Timmy]

sounds like MON is what what i\'m thinking of. Maybe v-power has a higher MON rating than tesco\'s 99ron. I\'m sure shell use there is a reason for shell using different additives.
 
Anyway if anyone wants to try it.
 
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 (128 oz = 1 gal):
100 oz of toulene for octane boost
25 oz of mineral spirits (cleaning agent)
3 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