Oakhurst Dairy, based in Maine, has announced the conversion of their delivery trucks to a biodiesel blend.

Oakhurst credited tax incentives for driving the decision to convert 90 percent of its vehicles, making it the largest private biodiesel fleet in New England. Biodiesel is produced in Maine from waste vegetable oil. Except in the coldest weather, the delivery trucks will use a blend that’s 20% biodiesel and 80% petroleum diesel. Officials say the ratio reduces air pollution without requiring engine modifications.