How many of the folks do you see on these threads that are developing modifications to their fuel tanks, lines and engines to run the stuff without destroying them? I can't recall any of them.
Ahem.

Aluminum tank.
Braided line on the fleshy side of the firewall, automobile fuel line on the noiser side.
Fuel filter in addition to the gascolator.

Then again, my engine isn't certified and is designed to run on automotive fuel in the first place. I'm fortunate that we have a high test ethanol free gas station convenient to the airfield, but I'm sure at some point some 100LL is going to go into the tank. If I need some juice at some distant field I'm not scavenger hunting; I'm gonna put up to ten whole gallons of Super Aviation Fuel in and go!