Plug-in hybrids: 100 miles per gallon or 59?
Plug-in hybrids have emerged as the favorite form of transportation for reducing greenhouse gases in the near term, but calculating their energy efficiency can be a little complicated.
Plug-ins won't conk out after 130 to 200 miles, like electric cars, and they don't require major technological breakthroughs, like hydrogen cars. Converting a Prius to a plug-in hybrid costs about $10,000 to $15,000 now--that's part of the reason only about 50 exist--but if car manufacturers decide to make these at the factory, the additional cost may only run $6,000 or so, say proponents. That'… Read more