I do understand your argument but appreciate that one candidate will not embody everything on the list of must haves. Sounds like ethanol is the deal breaker for you.
That means the EPA isn't going anywhere.
I can't think of a single agency which has done more damage to American Industry, and the guy who is going to make America great again just telegraphed that he is not going to shut it down.
That sort of cognitive dissonance, riding on the heels of Iowa's Governor calling to defeat Cruz because Cruz would eliminate the mandate reeks of selling America down the river for a 'deal'. If 10% of your MPG, and damage to fuel systems in older cars, small engines, outboard motors, generators, welders, and lawnmowers, not to mention marine engines, doesn't hurt America, just wait until they mandate even more.