That is the reason they went across the country and dug-up most of the tanks at gas stations, and replaced.Bring back that old leaded gas; those were the days! In those markets where ethanol blends are the norm, things may have changed since then. The folks selling fuel stabilizers will tell you that the ethanol begins to separate from the gasoline as soon as one week. This, and the added corrosiveness of ethanol is supposed to lead to rusting problems for steel tanks not designed to store it.
I use such a stabilizer in my bike, just to avoid these potential problems from the gas sitting in the tank.