Fuel Efficiency

Leaked information shows how the oil industry is fighting climate-change legislation in three states.

We compare rated fuel economy of the top-selling full-size pickup trucks.

First Hyundai and Kia cut fuel-economy ratings on a dozen models, then Ford on the C-Max. Then, Ford cut ratings on the C-Max again, along with those of five more models. Are there more to come? Industry sources have quietly been discussing in recent weeks that more adjustments to EPA gas-mileage...

The 2016 Mazda CX-3 debuts at the 2014 LA Auto Show.

The 2016 Honda HR-V debuts in final specification at the 2014 LA Auto Show.

Hyundai and Kia plan to triple the number of green cars in their combined lineup.

Porsche is testing a semi-autonomous system designed to maximize both efficiency and performance.

Volkswagen will launch a 2.0-liter diesel engine with an electric turbocharger.

Ford is offering dealers a bonus if they increase sales of certain models.

By most accounts, the world is pretty much awash in oil these days. Increases in North American shale-oil production have boosted supply to the point where there's now discussion of the U.S. becoming a net oil exporter sometime in the next decade. Meanwhile, the vehicle fleet is slowly getting more...

EPA range and efficiency ratings for the 2015 Volkswagen e-Golf electric car are in.

Electric turbochargers could become more common as carmakers work to boost fuel economy.

We compare the gas mileage of two green mid-size sedans.

About 18 percent of Americans have used a car-sharing program, according to new data.

Hyundai announces a new six-speed automatic transmission for hybrids.

The 2015 Hyundai Sonata Eco is the most fuel-efficient version of the Korean maker's mid-size sedan, aside from its Sonata Hybrid model. And this year, the Sonata Hybrid uses the carryover body from the last-generation model--meaning that if you want the highest-mileage Sonata with the new and more...

A plastics-industry backed study says fuel economy is the primary factor when buying a car.

The EPA plans to audit more of the gas-mileage test data submitted by carmakers, and tighten its rules for that testing, after fuel-economy ratings on almost 20 recent models proved to be too high and had to be reduced. The move follows the highly publicized rollbacks of gas-mileage ratings over...

China will publicly shame offending carmakers, and limit production.

Led by Volkswagen CEO Martin Winterkorn, carmakers are asking for less-strict European emissions standards.