It's rubbish, but I can't drill my own oil so I'm stuck with the crap.
The EPA knows this will ruin motors over the long term. Think they give a damn? Nope. That's the end-game after all. Thin the petrol herd year after year, and offer ginormous rebates (using worthless USD) on electrical cars. One must only consider the success of E10 and the resulting global food shortages (and worsened fuel economy) to realize that further enriching our fuel with corn will surely compound those problems. Less food for the poor, and more $$$ per mile. It's exactly what this world needs. 
Diesels look more tempting with each passing day.