The six-month demonstration culminated in a report showing California-based fleet States Logistics' CO2 reduction of 72.9 tons compared to straight petroleum diesel.

Eventually, this quantified data may be used to sell carbon offsets on the voluntary markets, but today they clearly show States Logistics' efforts towards reducing CO2 and other pollutants.

States Logistics ran seven trucks: four on soy-based B5 (5pc biodiesel and 95pc petroleum diesel) and three on B99 (99pc biodiesel and 1pc petroleum diesel).

The B99 trucks (three-axle International model 8600) ran 48,198 miles and consumed 8,770 gallons over the six-month period.

The equivalent straight petroleum diesel output would have been 89.9 tons, but with B99, the output was 19.8 tons for a savings of 70.1 tons.

The B5 fleet (two-axle flat bed) traveled 61,433 miles and consumed 7,090 gallons of B5.

Equivalent petroleum CO2 output would have been 71.4, but with B5 the output was reduced to 68.6 for 2.8 tons of CO2 reduction.

In addition to CO2 reduction, an estimated 119 pounds of particulate matter were eliminated from the exhaust during the six-month period.

Carbon monoxide (CO) was reduced by over 500 pounds, hydrocarbons (HC) by over 50 pounds, and sulfur dioxide (SO2) by close to 40 pounds.