President Obama will call for all new federal vehicles - the government owns 600,000 of them - to run on alternative fuels after 2015, according to a preview of a major energy speech he will deliver today at Georgetown University. "We have already doubled the number of hybrid vehicles in the federal fleet," according to a White House fact sheet released this morning. "Today, the President is calling for administrative action directing agencies to ensure that by 2015, all new vehicles they purchase will be alternative-fuel vehicles, including hybrid and electric vehicles." Obama will announce $7,500 tax cuts for consumers who purchase electric vehicles, in pursuit of White House plans to put one million electric vehicles on the road by 2015. There will also be grants for communities to purchase electric vehicles and more research and development funding for battery research. The federal fleet burned more than 414 million gallons of fuel in 2010, according to the General Services Administration. The total included about 322 million gallons of gasoline, more than 75 million gallons of diesel, 8.2 gallons each of biodiesel and ethanol.