How will it destroy your car?
This is why marinas and airports typically will sell non ethanol gasoline. It is an inconvenience when you can not start your snow blower. It can be a life and death situation if you have a problem with your boat of plane engine.
It destroys small engines with plastic parts internal to their design and cars made before it was contemplated as standard. It makes certain parts brittle, clog and the mixtures for air/fuel get out of adjustment. The is also out-of-phase separations in fuel tanks that can be very problematic.
Go look at your owners manual. Virtually all of them (except for FLEX Fuel cars) say that any gas over 10% will harm you engine and the warranty will be VOID if you use it.
Ethonal eats unprotected metals in the fuel systems.
So metal lines. Metal parts in the pumps unprotected fuel injectors.
It also burns hotter so valves not designed to deal with that also tend to fail sooner.
Alcohol more than 10% attacks any of the rubber/plastic that is containing it that is not specifically designed for E85 fuels. It damages carbonators (mine is fuel injected - so no bullet there) and it raises cylinder head temps leading to distortion and potential damage of the valves and valve seats. And, to top it off.. you have to buy more fuel per mile to drive it. E85 used to be priced lower than 10% or E90. This is the creepy thing they are attempting. To lower gas prices 5% and destroy the cars of the lower middle class and the poor in one swoop. But the shift to alcohol only lowers the price, not the cost. It’s a sham, and needs to be fought not accepted. And, if you are subject to emissions testing, many cars will fail that would have passed with a 10% blend.