WASHINGTON — The U.S. Energy Department is proposing an update to a decades-old calculation that determines the petroleum-equivalent fuel economy of electric vehicles for NHTSA's fuel economy standards.
The proposed rule-making is in response to a 2021 petition submitted by two environmental groups, the Natural Resources Defense Council and Sierra Club, which argued the calculation is outdated and resulted in "significantly inflated" EV fuel economy values.
"Excessively high imputed fuel economy values for EVs means that a relatively small number of EVs will mathematically guarantee compliance without meaningful improvements in the real-world average fuel economy of automakers' overall fleets," the petition said.
For example, applying the current calculation to a 2022 Ford F-150 Lightning electric pickup results in a rating equivalent of about 238 mpg. Under the proposed rule-making — which lowers the petroleum-equivalency factor fo…