Hi all:
I'm gonna keep an eye on this thread. I started baselining my mileage yesterday, so I can experiment later if I decide to. I want to make one comment...
Increasing the octane of your fuel does not, by itself, increase performance of your engine. It does permit it to be tuned for more power by advancing the timing, raising the compression, or leaning out the fuel mixture, because higher octane fuel is less likely to detonate. However, unless you have your engine tuned for it, you won't see any difference in performance by adding toluene or any other octane booster.
Regards,
John.