Are you saying that you think that E15 is a good thing Bibio?
In the US the push to use more ethanol has mainly come from the corn lobby and a desire for the US to be self sufficient in energy products.
https://e360.yale.edu/features/the_c...or_environment
It was more of a political decision from 2012 than a science based decision.
You use 15-25% more fuel with E15
https://www.fueleconomy.gov/feg/ethanol.shtml
I see no advantages and many disadvantages to ethanol in petrol (so I guess I'm a dumb person).