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This table shows the effectiveness of B100 BioDiesel in reducing greenhouse gas emissions compared to other types of vehicles including the ULEV Toyota Prius:

Comparison of CO2 (Greenhouse gas) emissions in 2004 VW Jetta Wagon using various engines/fuels
Model City MPG Highway MPG CO2 tons/year
Automatic 2L Gasoline 23 30 7.4
Automatic TDI 1.9L PetroDiesel 32 43 5.8
Automatic TDI 1.9L B20 BioDiesel 32 43 4.9
Automatic TDI 1.9L B100 BioDiesel 32 43 1.3
for comparison:      
2004 Toyota Prius 60 51 3.5
2004 Ford Explorer 4L 2WD 16 21 10.7

based on fuel economy numbers from http://www.fueleconomy.gov/feg/findacar.htm using 15,000 miles driven per year, 45% highway, 55% city driving. BioDiesel reduction numbers from NREL study http://www.nrel.gov/vehiclesandfuels/npbf/renewable_diesel.html

CO2 reduction from BioDiesel is due to the closed loop of the fuel cycle from plant to combustion and back

In the future we'll add other emission components to this page.