The government can do little to nothing to reduce the price of oil, because the price of oil is determined by a middle-eastern terrorist organization by the name of OPEC. But the government can reduce the price of gasoline. They can eliminate federal gasoline taxes. That would take about 50 cents off of each gallon.
Oh, they can also let the oil companies drill for oil in the US, both on land and offshore, but that isn't an immedate fix because it will take time to drill for that oil. But that would kick OPEC in the balls. Maybe they'd play nice again if we told them that they can keep all their oil because we've got plenty of our own. Or, maybe they'd just sell it all to China. Either way, the price of oil isn't going to go down unless China and India decides that they don't need any more of it!