Corrosion isn't as often as you believe ... And all gas Stations and cars made here, as it should be in there have protection (chrome or nickel surface layered if steel tanks are in use) that goes beyond the needs, even if you run the car 1/4 full once a month and don't drain the tank. My cars are imported from US and japan, and see alcohol for the last decades and no corrosion is envisioned. If your station are still on gascolators and domestic gluee, that's a infrastructure and modernization problem ... The very fairy tale is the overreaction to the edges of the funny insanity. Simple measures that should be implemented already as of right now, will avoid such problems. Cool down people your car won't fall down to the floor if you use 15% ethanol. Wake up from the nightmare, because Sandman isn't true.