Kick the Oil Habit?

This study by the Pacific Northwest Laboratory, a "research organization" (I guess you'd call it) that is jointly run by the DOE and Battelle, finds that the U.S. could power 84% of its vehicles if they were "plug-in hybrids." This is one of a number of promising ideas. I'd still want at least a back up gas tank for those times the power goes out around here.