The U.S. will release 30 million barrels of light sweet crude from its Strategic Petroleum Reserve over next 30 days.

FORBES: U.S. Opens Oil Reserves: Crude Futures Continue To Fall

And breaking that down a little further, cars and light trucks are the largest users of petroleum, given the reliance on foreign supply of oil.

NPR: Roundtable: Chrysler's Deep Cuts, 'Rebranding' Africa