Most U.S. Drivers Say They Beat EPA Fuel Economy Ratings

More than eight in 10 U.S. drivers claim their real-world fuel economy is better than the government ratings for their vehicles, according to AAA.

The driver services group says only 2% of owners report fuel economy that matches the Environmental Protection Agency rating for their car or light truck. But the analysis of more than 37,000 records cautions that self-reported data is of little statistical use, since AAA could not verify the estimates provided.

On average, drivers report their real-world mileage is 12% greater than the combined city/highway EPA estimate for their vehicles, according to the study.

Reported results vary by engine and transmission type. Owners of diesel-powered vehicles say they beat their EPA rating by an average 20%. Those driving vehicles with manual transmissions report 17% better mileage compared with 7% for vehicles with automatic gearboxes.

The study shows turbocharged engines often fall below their government fuel economy rating. For example, owners of sedans with V-6 engines claim they beat their rated fuel economy by an average 9%. But those driving sedans powered by a turbocharged 4-cylinder engine report mileage an average 4% below the rated level.

Likewise, truck owners report 5% better fuel economy with a V-8 but 9% worse fuel economy with a turbocharged V-6.