Ya gotta ask yourself ... if it is a solvent for rubber then it chemically suspends it as some other compound, probably in liquid form but could also be an emulsion.
In either case, the emulsion/compound has its own set of properties different from the refined fuel. Chemical, Thermal and/or physical. So where does it go when you transport the fuel through the filter, injectors and intake valves, and then burn the fuel?
Umm, lets see -- some possibilities are fuel filter (clog or blockage), Fuel Injectors (this CAN'T be good), intake valves, rings, exhaust valves and finally, catalytic system.
Nope, I don't think I want to try it!