All good ideas, but be sure you don't run afoul of the tax man. By law, ALL fuel used in vehicles driven on public roads MUST have the applicable fuel taxes paid on it. You are breaking the law if you don't pay that fuel tax.
The big catch 22 in some states (like the Republik of Illinois) is that in order to pay the fuel tax, you have to have be a registered fuel producer/distributor. A couple of years ago some private citizen got jumped because he was recyling cooking oil in his VW Rabbit diesel. He was tagged for not paying the fuel tax. So he tried to cut a check to the state. The IL department of revenue rejected the check because they didn't have an account to credit it against. So the poor sap tried to get an account, and found out that the state legislature (in their wisdom) had decided that you had to produce/process a minimum of 15,000 gallons per year to qualify for an account -- anything smaller wasn't worth their time and effort in administering the law. It took a special act of the Illinois State Legislature for this guy using recylced cooking oil in his VW Rabbit to get square with the state.
BTW -- that's why farm fuel is different color than road fuel -- the dye in it indicates whether or not the fuel tax has been paid. You can be arrested for using farm diesel in a truck operated on the public roadway.
And people wonder why I'm opposed to the government taking over the health care system...