Fuel Efficiency

Pickups trucks continue to lag other segments of the market in terms of efficiency improvements. When will they catch up?

With Honda's two-motor hybrid system, the 2021 Insight hits a high in city driving and is shaping up to be the highest mileage sedan without a charge port.

Although Fiat Chrysler sold a higher rate of hybrid vehicles than any other automaker, it came up last in fleet fuel economy. How'd that happen?

Some traditional internal-combustion components, like transmissions, could use a rethink yet—with more smarts, not more gears.

The Model S Long Range Plus nudges even closer to the 400 miles CEO Elon Musk has suggested is in the near future.

The big electric sedan will get a 400-mile highway range, not by packing in more battery cells but by focusing in on efficiency at every step.

EPA ratings released yesterday confirm that the Tesla Model Y has nearly the range of the Model 3—and some unexpected advantages.

Instead of doing away with some of the current incentives for hybrids and PHEVs, it might just limit the annual hike to 1.5% through 2026.

The 2020 Taycan Turbo electric sedan achieves just 201 miles in the official EPA range test, which puts it below the Audi E-Tron electric SUV.

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

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 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.

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.

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.