Study suggests gas-guzzlers pollute far more than believed

A new study suggests that as gas-guzzlers get older they pollute far more than government tests acknowledge, and that the government should measure pollution not by miles driven, but gallons of gas used. (Intech via MotorTrend).

BMW and Toyota vehicles pollute less over time, Hyundai, Mitsubishi, Chrysler, and GM were most likely to pollute.