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Fuel Fact of the Week

Fact #1141: Five Different Test Cycles Are Used to Determine Fuel Economy Estimates on New Light-Duty Vehicles


The fuel economy estimates that are shown on the window stickers of all new light-duty vehicles sold in the United States are a result of calculations and data from five different fuel economy test cycles conducted in a controlled laboratory setting.

The city cycle represents driving in stop-and-go traffic.

The highway cycle represents free flow traffic with longer periods of higher speeds.

The high-speed cycle represents both city and highway driving with more aggressive acceleration and braking.

The air conditioning cycle represents driving when the outside temperature is hot and the vehicle’s air conditioner is in use.

The cold temperature cycle represents driving when the outside temperature is cold.

The Environmental Protection Agency (EPA) certifies new vehicle fuel economy and makes adjustments to account for variables that are not included in the testing, such as wind, hills, and road conditions. Vehicles that are not tested include motorcycles; pickup trucks and cargo vans with a gross vehicle weight rating (GVWR) over 8,500 pounds; and passenger vehicles, such as SUVs and passenger vans, with a GVWR of 10,000 pounds or more.

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Past Fuel Facts of the Week.

Question of the Month

How is fuel economy determined and reported for alternative fuel vehicles?

Last month we learned about how the U.S. Environmental Protection Agency (EPA) determines and reports conventional light-duty vehicle fuel economy ratings. While alternative fuel vehicle (AFV) fuel economy testing is largely similar to that of conventional fuels, the EPA makes some adjustments to account for different vehicle technology and fuel energy content. By tailoring AFV fuel economy testing and reporting, the EPA is able to provide apples-to-apples comparisons and allow consumers to make informed decisions.

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