How does BioDiesel stack up to other car/fuel choices in the emissions area?

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
NOTES: 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.