Fuel Efficiency

CEO Elon Musk boasted that the aerodynamics of the Tesla Cybertruck electric pickup could be "insane for a truck."

Despite the outcome of federal rules for emissions and fuel economy, California could accomplish serious gains on a regional basis.

The state is finished buying fleet vehicles from companies that sided with the Trump administration—and could be done with internal combustion.

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 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.

The annual efficiency report from the IEA reveals a number of factors that have slowed worldwide energy efficiency improvement.

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.

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.

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.

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 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