[A1337STI]

Quite a while ago i bought a 1 or 2 gallon container of toluene at a home depot, i don't recall the price but it was really cheap. Gas by law in the us is allowed to be ~ 55% toluene, (and higher in other countries) and its like 114 octane. i mixed it up so i'de have 96 and ran it for 2 tanks. It felt smoother, but then a month later i had a Fuel injector problem. (which i think is unrelated since only 1 of the 4 had any problems, And Since the fuel injector treatment subaru wants STI owners to do every 20K miles uses almost entirely toluene as the cleaner)

[random theory - if the added octane let my car boost higher than the fuel injectors would have to inject more fuel then ever before and maybe one of them wasn't up to the task ... I did do a an ecu reset directly after doing that so its possible, or reads well to me ... ]

But the coincidence was enough for me to not want to try that again. I think it was $10 for a gallon, and around $40 for a 5 gallon bucket. Great deal considering its 114 octane, Horrible deal if it does cause damage to things (really really shouldn't thought, considering gas is mostly toluene already)

But gas is formulated to burn well and just mixing in a larger part toluene with out knowing what other catalysts are used and in what amounts, could easily lead to less power.