There's no doubt Butanol is better. I've been reading about it at least a decade but getting around the farm lobby is a huge hurdle plus making it inexpensively hasn't been easy either.
I saw where they drove a car across the US and back on butanol. Just adding a few gallons to your tank before a smog check will make your old car cleaner than new. Lots of benefits. Doesn't combine with water, corrode pipes, has almost the same BTU as gasoline therefore you get the same mileage and HP.
It can be made from switch grass, etc. etc.
So where do you get it? At a paint store and that's been refined from fossil oil.