The US government is considering implementing a new vehicle labelling system which would grade cars on their eco credentials.
All new cars from the year 2012 would receive a grade between A+ and D based on their fuel economy and carbon emissions under the proposals from the Transportation Department and Environmental Protection Agency.
Customers would also be able to scan the vehicles when shopping to compare the different models.
The Associated Press reports that electric cars would receive an A+ grading and plug-in hybrid electric vehicles would be given an A classification. The average family car in the US is likely to be B rated.
Vickie Patton, Environmental Defense Fund's general counsel, suggested to the news provider that currently the green information provided for vehicles is too complex.
"You shouldn't need a PHD to buy a car. These proposed new labels will make it much easier for consumers to comparison shop," she said.
In the UK, WhatGreenCar recently named the Toyota Auris hybrid, which has emissions of 99 g/km, as its Car of the Year.