December 31, 2014, 7am PST
The effect of low gas prices on motor vehicle selection by consumers could set back President Barack Obama's climate legacy, which includes obtaining fuel economy standards of 54.5 mpg by 2025.
June 19, 2013, 6am PDT
It may seem counter-intuitive to charge extra fees for the cleanest, most fuel-efficient vehicles on the road today - including those that qualify for a federal $7,500 credit. But ten states are doing just that to keep roads well-funded.