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<http://www.fueleconomy.gov/feg/ethanol.shtml>
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<http://www.fueleconomy.gov/feg/biodiesel.shtml>
Fueleconomy.gov. “Natural gas” May 17, 2007
<http://www.fueleconomy.gov/feg/bifueltech.shtml>
Fueleconomy.gov. “Propane” May 17, 2007
<http://www.fueleconomy.gov/feg/lpg.shtml>
Fueleconomy.gov. “Hydrogen” May 17, 2007
<http://www.fueleconomy.gov/feg/hydrogen.shtml>