Fuel Efficiency

Changes to federal emissions and fuel economy standards have lasting (and delayed) effects to major shifts in fleet fuel economy.

Mercedes-Benz E-Class and C-Class diesel models are at the center of a nearly $1 billion fine in Germany.

California is not yet doing enough to clean up its emissions, the EPA says, as it looks to revoke the state's authority in favor of lower emissions standards.

The Trump administration is ready to reveal its plan for revoking California's control—including its electric-car mandate, according to reports.

Andrew Wheeler now says that the administration isn't committed to revoking California's emissions authority.

The push for higher-mileage new cars isn't as controversial as the federal government might be making it sound.

The German supplier ZF has developed a 2-speed transmission that could help improve electric-car efficiency and driving range.

The National Highway Traffic Safety Administration has acted to freeze fines for companies that violate federal fleet fuel economy standards.

The governors of 23 states plus Puerto Rico have urged the Trump administration to reconsider its proposal to freeze the federal fuel efficiency standards through 2026

A wide range of Hyundai and Kia vehicles, starting with the 2020 Sonata, will be soon be getting engines with a next-generation valve system.

Michelin has introduced a prototype airless tire that will soon be tested on a Chevrolet Bolt EV fleet in Michigan.

If the federal government revokes California's waiver allowing it the authority to regulate emissions, the state's agency is making clear it will find a way to keep the polluters out.

Tesla has replaced the induction motor at the front of its Model S and Model X with a permanent-magnet motor, as used at the rear axle of the Model 3.

With electric pickup trucks from Ford, GM, and others—including newcomers like Rivian—looking likely to arrive in the next few years, the truck field could be on the verge of a clean, quiet, tailpipe-emissions-free shakeup. That said, you wouldn’t know this segment as being poised...

If more power, a 226-mile range, and a $39,405 base price—before considering the full $7,500 federal EV tax credit you can still get—collectively seems like the sweet spot for the Leaf, you probably have GM to thank. Nissan has admitted that it never planned to push the Leaf above a...

An EPA report released Wednesday shows that cars are getting better gas mileage in response to rising fuel economy standards. Yet a roaring economy and low gas prices have put Americans on a truck-buying spree, and the EPA is working to undermine those standards. According to its annual automotive...

In just one model year, Kia has more than doubled the rated driving range for the Soul EV. The 2020 Kia Soul EV, which is expected to reach dealerships this spring, will go 243 miles on a charge—four more miles than the Kia Niro EV—according to the EPA, in ratings that were released...

It turns out there's more than one way for automakers to meet fuel-economy targets. One is to develop and sell more fuel-efficient cars and trucks. The other—as demonstrated over the years by quite a few automakers—is to pay fuel economy fines to the U.S. Treasury as a course of doing...

Last week the U.S. EPA released final fuel economy numbers for the 2020 Toyota Corolla lineup. They include a confirmation of what Toyota had claimed when it introduced the lineup last fall: that the Corolla Hybrid will carry an EPA combined rating of more than 50 mpg. The 2020 Toyota Corolla...

Ten years ago this week, in February 2009, Green Car Reports published its first story—one packed with insight regarding the Chevrolet Volt, which was then still nearly two years away. Despite all that could have happened to the Volt in GM’s bankruptcy, it arrived on time and was...