The proposed stickers are mandated by the Energy Independence and Security Act of 2007 and require the EPA and NHTSA to give ratings to vehicles based on fuel economy and the emission of greenhouse gases and smog-forming pollutants. One of the proposed stickers (below) would give each car a letter grade, report-card-style, based on fuel efficiency -- an idea quickly denounced by automakers. The range would run from A+, for zero-emission vehicles only, down to a D, meaning even the worst offenders would be spared a "failing" grade.

The other sticker is more of an evolution of the current information labels, and lacks the letter grade. Both contain a code that, when scanned by a smart phone, would send more information about the vehicle to the device.