Several major auto makers on Friday embraced the Obama administration's proposal to push the industry further away from once-dominant gas guzzlers to more lean and efficient vehicles. The proposal, which is the result of months of negotiations between the Obama administration and auto makers, would require the companies to reach an average fuel efficiency across their U.S. fleets of 54.5 miles per gallon by 2025. "This agreement on fuel standards represents the single most important step we've ever taken as a nation to reduce our dependence on foreign oil," Obama said at an event announcing the new standards. Flanked by top auto maker executives, Obama said the new rules would lower the country's oil use by 2.2 million barrels a day over the next 15 years. The rules will cut more than 6 billion tons of carbon emissions for the duration of the program.