Tier 3 Vehicle Emission and Fuel Standards Program

'The Tier 3 program is part of a comprehensive approach to reducing the impacts of motor vehicles on air quality and public health. The program considers the vehicle and its fuel as an integrated system, setting new vehicle emissions standards and lowering the sulfur content of gasoline beginning in 2017..."
Fuel standards

EPA Proposes Achievable Cleaner Fuels and Cars Standard,

"Based on extensive input from auto manufacturers, refiners, and states, the U.S. Environmental Protection Agency (EPA) today proposed sensible standards for cars and gasoline that will significantly reduce harmful pollution, prevent thousands of premature deaths and illnesses, while also enabling efficiency improvements in the cars and trucks we drive..."
EPA Proposes Achievable Cleaner Fuels and Cars Standard

Historic 54.5 mpg Fuel Efficiency Standards

"The Obama Administration today finalized groundbreaking standards that will increase fuel economy to the equivalent of 54.5 mpg for cars and light-duty trucks by Model Year 2025. When combined with previous standards set by this Administration, this move will nearly double the fuel efficiency of those vehicles compared to new vehicles currently on our roads. In total, the Administration’s national program to improve fuel economy and reduce greenhouse gas emissions will save consumers more than $1.7 trillion at the gas pump and reduce U.S. oil consumption by 12 billion barrels..."