My choice of race fuel has been 99.99% methanol about 120 octane. It is also just as corrosive, yet has been the standard race fuel for 1000’s of aluminum Briggs racers for decades. We flush ,with gas, the alky out of the fuel system at the end of every race day and drain the crank case oil as it can be easier to contaminate the oil when running the even larger ratio’s of fuel air. Methanol is easy for tech as it is clear, a simple mix with distilled water will show if any additives are in the mix where as E85 is contaminated with 15% gas. The corrosion occurs mainly in float bowls or in the crank case when the fuel is left there exposed to outside air. It will also swell rubber carb parts and venton tipped needles are used in tillies.
Methanol is power in the can, runs very cool, clean and is still cheaper than any race fuel yet it does take twice the amount of methanol as it does gas.
100% Ethanol 1/9
100% Methanol 1/6
The dirt trackers like the unlimited all stars use methanol in stroked and open 2 cycle motors but they do have to maintain a large fuel supply for the duration of their races, I would imagine a 125cc motor could use more fuel than our tanks hold for a 20 lap long coarse race.