Not everyone can get 53 cent diesel, but if you can, good for you. Come to think of it, 2.50 for gasoline is pretty impressive too. How? Gasoline is bad enough here that it is now worse than diesel ($3.71 to 3.65).
Butanol, despite your juvenile play on words, can be made from the same materials as ethanol, but it has an energy density a lot closer to gasoline, and an octane rating closer as well (not that 105 octane is a bad thing, but it is a waste with current compression ratios). It's fuel specific energy is actually a little higher than gasoline. Here, granted it is Wikipedia, but it is likely a better source than I am:
Butanol fuel - Wikipedia, the free encyclopedia