Anyone here ever use toluene or xylene as a fuel additive

[Greaterthenjake]

Trying to find opinions or even best practices in using either. Toluene is already an aromatic so I would think it may not have a huge effect on the fuel system other than adding octane.

[pbf777]

     Toluene is already present in many/most fuels, so the typical fuel system componentry should be resilient, but increasing the ratio may, as it is also a solvent, begin to have an effect at some point.   

     Scott.

[Greaterthenjake]

I had heard of it's use as an easy cheap octane booster. It's a ratio of about 2.5gallons to 5 gallons of 93 should be around 100 octane. No MMT to worry about either. Asking here as there is usually a wealth if knowledge on these things. Xylene I guess is similar but from having used the stuff it eats everything and the smell is just awful.

[GerryP]

This has come up on speedtalk and actual engineers and scientists have weighed in.  I suggest you search over there.