U.S. Department of Energy Energy Efficiency and Renewable Energy
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Vetting Aftermarket Systems and Devices

A photo a man in glasses standing over the open hood of a car with a natural gas engine.

Learn how to tell if an alt. fuel conversion system or aftermarket device has been certified to reduce emissions or improve fuel economy.


November 24, 2014

Revamped Search Tool Serves Up Alternative Vehicle Options Faster

A graphic of various small blue vehicles with one larger, green car shown under a magnifying glass.

Browse light-, medium-, and heavy-duty AFVs, engines, and hybrid systems easier with the new Alternative Fuel and Advanced Vehicle Search.


October 30, 2014

Driver Behavior Changes to Improve Efficiency

Photo of a vehicle on a highway

What driver behaviors can help reduce petroleum consumption?


February 19, 2014

A Valuable Resource: The Fuel Economy Guide

Photo of someone fueling a vehicle

Annual guide provides MPG ratings for more than a thousand 2014 vehicles


December 12, 2013

Label Your Used Car's Fuel Economy

Graphic of a fuel economy label

Clean Cities Top 20 Facts

#14 FuelEconomy.gov helps consumers and businesses share used cars' fuel economy


October 18, 2013

Spotlight on Fuel Economy

Chart showing that in general fuel economy decreases as speed increases over 50 mph

Clean Cities Top 20 Facts

#7 Small changes can make a big impact


August 9, 2013