If you were mad about $4 per gallon of gas, think about this: the Air Force is spending $59 per gallon on "green biofuel" that supposedly has to compete with traditional petroleum jet fuel.

­The U.S. Navy’s Great Green Fleet demonstration taking place this week, using biofuels at an alarming $26 per gallon, will flaunt the Pentagon’s wasteful spending and is already angering some U.S. lawmakers.

But a lesser-known Air Force demonstration cost the government more than twice as much for biofuels.

Purchasing 11,000 gallons of alcohol-to-jet fuel from a Colorado biofuels company at $59 a gallon, the Air Force spent $649,000 to prove the efficiency of alternative fuels in military aircraft. At a cost of more than half a million dollars, the Air Force hopes the biofuel, purchased from Gevo Inc, will eventually compete with the cost of petroleum jet fuel at $3.60 a gallon.