The following is from Jon Van Gerpen - from the University of Idaho, who has done a great deal of development on biodiesel with the University.. 
"Biodiesel has a lower energy content (lower heating value of 37.2 MJ/kg for soybiodiesel) than No. 2 diesel fuel (42.6 MJ/kg for No. 2 diesel fuel). On a weight basis, the energy level is 12.5% less. Since biodiesel is more dense than the diesel fuel, the energy content is only 8% less on a per gallon basis (32.9 MJ/liter compared with 36.0 MJ/liter).
Since diesel engines will inject equal volumes of fuel, diesel engine operators may see a power loss of about 8.4%. In some cases, the power loss may be even less than this because biodiesel's higher viscosity can decrease the amount of fuel that leaks past the plungers in the diesel fuel injection pump leaving more fuel to be injected."
The original article is on the following website: 
http://www.uidaho.edu/bioenergy/Publications.htm
so there.. "oomph", now defined..
regards,
biodiesel bob
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