Actually, that's NOT the case. Especially in the case of older engines, the higher concentration of alcohol in the fuel acts as a solvent, even more-so that gasoline, getting rid of needed oil on both intake valves, and if there's any blow-by, from the cylinder walls as well. It will also play hell on any seals or lines not designed specifically for use with fuel that includes alcohol. Finally, being hydroscopic, it tends to attract water and cause rust.
Alcohol in fuel is a well known old engine killer. Sure, they can design engines to run on it, but it also requires more fuel for the same amount of driving.
Mark
yeah yeah
You ever heard of Ethyl grade gasoline? It was the fuel of preference(well, except for aviation fuel or straight alcohol) for all the hotrodders in the early 70s.
and it was the same thing as E10.