Obama thinks Detroit can achieve 52 mile per gallon. In fact they are making regulations right now that will require 52 mpg in a few years. The only way to do this for real is to stop making pickup trucks, SUV's, full size sedans, and minivans, and make nothing but tiny four seat econoboxes. In the real world, the only way to increase gas mileage is make the car lighter and the engine smaller. So get ready for a lot of plastic, less sound deadening, and little tiny engines that have to wind up to 10,000 rpm just to pull up a steep driveway. And wait for the turbo to spool up before you get much power.
If you have a family to move and a house to maintain, your only hope is to find a used minivan surviving from the 2010's and restore it.