That used to be true.

For a while now, any petrol car can run on high ethanol mixed without any damage.

True but it was a real consideration for a surprisingly long time. And you still find a lot of lawnmowers that tell you not to use E mixes in them, I am not sure why (my guess are either they are being super cheap on the rubber or just acknowledging the fact that lawnmowers tend to sit and the E mixes sitting tends to corrode things and go bad.)

Then why use gasoline at all? This might sound sacrilegious, but I honestly wish LPG had more pull than it did in Canada.