Originally Posted by bvl

Unless they changed their product if you do the math you will see Octane booster products in Pep Boys and the like barely raises octane at all...unless you use several bottles of the stuff which isn't very cost effective and may be too much chemicals for a single treatment.

If you want to really raise octane, use Toluene or Xylene. $/gal will be far less then those little marketing bottles and it actually works. You can get a gallon in the paint section of any hardware/paint/home dictator store.

Example: say you get a bad batch of fuel in the winter and audibly notice some knocking. Engine management will retard timing but for safety, tossing in 1 gal of toluene will raise your effective octane rating 1.4-1.6 points (depending on what you started with) if you start out with 15 gallons of fuel in the tank. A pint of STP is a fraction of that on 15 gallons. The 2 points they advertise you have to read 2 points on how many gallons..not 'up to'.

Math good. Marketing bad.

- b