This is interesting: Check out this link
http://www.epa.gov/oms/renewablefuels/420b07019.pdf
This is an EPA Document which states
"Biodiesel is registered with the U.S. Environmental Protection Agency (EPA) as a motor vehicle diesel fuel and motor vehicle diesel fuel additive. It is registered for use at any blend level up to B100 in highway diesel vehicles. Biodiesel, as discussed in this document, does not include renewable diesel. Renewable diesel is a non-ester based diesel blend derived from non-petroleum resources, such as plant oil or animal fats or wastes. Because renewable diesel is processed in a refinery along with petroleum stocks, it becomes indistinguishable from petroleum diesel, and does not need to be blended downstream of the refinery.
Neat vegetable oils and recycled greases (also called waste cooking oil or yellow grease) that have not been processed into mono-alkyl esters are not biodiesel. These raw oils, used as fuel extenders or fuel substitutes, are not registered with EPA and are not legal to use as a motor vehicle fuel. Furthermore, cooking oil is physically and chemically different than diesel fuel and its use in conventional engines will generally cause negative effects on emissions and engine durability.
Because of the potential for increased emissions, it is considered unlawful tampering to convert a vehicle designed for diesel fuel to operate on waste oil without EPA certification. To date, EPA has not certified any conversions for waste oils. Even with EPA certification, conversions may violate the terms of the vehicle warranty. For more information on the certification process, please visit EPA's Web site at: www.epa.gov/otaq/cert/dearmfr/cisd0602.pdf (22 pp, 152 K, About
According to this EPA document - conversion of Fryer grease into BioDiesel is illegal! Somebody help me out....
Scott....