Gasoline is 10% ethanol. E88 is 15% ethanol. The EIA estimates that we use 376 million gallons of gasoline per day in the USA. That’s 37 million gallons of ethanol, minimum, per day.
I’m going to paste from a comment I made the other day:
There was a good discussion of this on Reddit recently. Sorry to link to Reddit, but it’s a good, topical post worth perusal.
https://www.reddit.com/r/Agriculture/comments/1dv7fw9/how_much_good_land_is_used_to_grow_food_for/
Not quite as simple as checkboxes, but the ability is there to some degree!