The latest NACS (a gas station / convenience store association) magazine published some interesting facts regarding where money goes on a gallon of gas, using 2007 average prices.
- 58%: Crude Oil
- 17%: Refining
- 15%: Taxes
- 9%: Distribution and Retail (20% of which goes to credit card companies)
- 1%: store income
For users of pure biofuel, the taxes, distribution and retail, and store income would all be about the same. I'm not sure how the rest of it goes, but my guess is that the raw materials (raw oil and other production inputs) would make up by far the largest percentage.