Re: Toluene & octane rating
I've used Toluene in the tank (I work in a lab) and noticed no difference. The problem is you have to add a hell of a lot to make a difference.
To get from 98Ron to 100Ron you will have to add about 10% of Toluene (if I remember correctly). In other words, in 10 gallons ofin your tank, 1 gallon would have to be Toluene (and 9 gallons Optimax).
You are much better adding Methyl Tertiary Butyl Ether (MTBE) as this in an oxygenate and actually helps the fuel burn more efficently, this stuff is pretty hard to get hold of for Joe Bloggs as it's now very controlled due to the effects on the environment.