Fuel Efficiency

With a technology that Hyundai is testing, trucks may be able to take advantage of fuel-saving platooning even on roads with other traffic.

A slightly larger battery pays off with both a longer electric range and better fuel economy numbers on Volvo's 2020 PHEV models.

The Union of Concerned Scientists homes in on Ford's smallest model for the U.S. market and its sub-30-mpg ratings.

The Model 3 might top the charts as the top-rated vehicle for energy efficiency in the U.S. market for the 2020 model year.

U.S. EPA ratings have confirmed that the Ioniq Electric is rated at 170 miles with its larger 38-kwh battery pack, arriving in 2020.

Four automakers and a trade group are joining the push toward “one national standard”—and stripping California of its authority to regulate tailpipe emissions.

With all loopholes banished, the new rules will reduce CO2, claimed the EPA Administrator in a recent Detroit address.

Passenger SUVs are to blame for growth in CO2 emissions, an upcoming paper finds, while the passenger-car sector has made CO2 reductions.

Until electric trucks arrive, the Ram EcoDiesel is the way to haul heavy loads without guzzling fuel at alarming rates.

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

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.

In a plan drawn with the EPA and NHTSA, the Trump administration is aiming to take vehicle emissions authority away from California.

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

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.

Automakers (17 of them) wrote a letter to President Trump asking for California to be included in his single national standard for revamping fuel economy rules.

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