by Donn Dears
Fleet mileage targets for 2022 – 2025 model years must be reviewed in 2018 before they can become final. They were initially augural, i.e., best estimates, when the joint EPA/NHTSA 2017 – 2025 national program was established.
The standards were established jointly by the National Highway Traffic Safety Administration (NHTSA), and the EPA.
The combined passenger car and light truck fleet wide compliance targets were set at 54.5 mpg, and 163 grams of CO2 per mile for 2025.
But the actual rules, as printed in the Federal Register, which are 577 pages long, are far more complicated.
First, the targets are set based on the vehicle’s foot print, i.e., the wheel base multiplied by the track dimensions. Smaller cars must meet higher standards.
Next, each manufacturer receives credits for adopting technologies that don’t affect test results, such as active grille shutters, stop-start systems, and high-efficiency lights.