The new fuel standard: CO2 per mile

Tired of not being able to reliably compare the fuel impact of hybrids and traditional engines? The new EPA standards open a door for more honest reporting in a changing car market. Instead of the old miles per gallon rating—which gets fudgy with cars that run even partly on electricity, and doesn't necessarily tell consumers the full story on the car's environmental impact—EPA is now mandating a CO2 emissions per mile rating, starting with the 2012 model year.