“There is no damage, if aluminum corrosion occurs it is probably from the absorbed water.”
Damage from higher combustion temperatures over gasoline.
The corrosion is caused by the ethanol then as it attracts moisture more readily than plain gasoline.
Alcohol has a lower combustion temperature.
The corrosion will not happen if you don’t leave fuel in your power equipment. The gas tanks have a hole in the cap and the humidity gets in.
A car fuel tank is sealed, the fuel is pretty stable under those conditions.
Having said all that, I’d rather have straight gasoline and ska-rew the phony ethanol-fuel industry. Alcohol is for drinking.
Obviously an engine built to run on alky will withstand it, but an engine built to run on iso-octane won’t tolerate the higher combustion temperatures.
I don’t oppose alky per se, but am more of a nitro-methane/methanol blend kind of guy.