The report said diesel-powered passenger vehicles are 35% to 50% more fuel efficient than similar sized gas-powered vehicles. Its research concluded that California save over 530 million gallons of gasoline-equivalent fuel per year by 2030 if diesel vehicles grow to 25% of the California market.
If diesel grows to 32% of California's vehicle market, the level of use on Europe's roads, California could save up to 930 million gallons per year by 2030.