I've mentioned butanol plenty of times here. Problem will be the same as ethanol. How do we manufacturer enough of it?
But, I would rather see my subsidies go to butanol, as it is more compatible and a more capable fuel then ethanol.
Biobutanol and butylfuel don't have the lobby behind it. Maybe one day as the hint of common sense might hit our politicians.
BTW, all the diesel's I've driven never had cold start problems. So, lets not give Butanol a bad rap yet. We also don't run ethanol 100%, only up to 85% in E85 for FFV vehicles. I bet that a 15% gas in butanol would make up for any cold weather issues.
Just look up the octane ratings, A/F ratios, and BTU's available in a gallon of methanol, ethanol, butanol, and gasoline.