Fuel Efficiency

Here are the widely available cars only fueled by gasoline that achieve 50 mpg combined or more based on EPA ratings. They all start under $30,000.

The wind-sail project uses an inflatable sail and telescopic mast to harness the wind, boosting a ship’s fuel efficiency by up to 20%.

Tesla might find another taker for its EU credits, but without FCA's thirsty lineup they'll be a harder sell.

With the NHTSA, it proposes to rescind rules that took away California's authority to set its own emissions framework and to mandate EVs.

The EPA expressed "concerns" about the process used to create the Trump-era rules that relaxed fuel-efficiency targets.

Such a thermal efficiency, only claimed previously by racing engines, isn't yet offered in any production model.

Virginia is the next state to adopt stricter standards on the way to a potential EV mandate.

Airstream is offering carbon offsets as well as pushing ahead with plans for an electric trailer that could make towing more feasible with an EV.

Even Big Oil now admits we're past the once-hypothetical point, and is pivoting for relevance in a new energy economy.

As automakers voiced support for a higher mpg standard, they suggested targets lower than those set during the Obama administration.

Although EV sales increased 50%, a massive shift to less-efficient SUVs offset any carbon reduction.

In the last days of the Trump administration, officials again yielded to lobbyists in offering a break on federal fines for gas guzzling fleets.

A group of truckmakers has moved the timeline for retiring diesel truck production 10 years earlier.

The electric-truck invasion hasn't yet started. Is 25 mpg the leading edge of pickup truck efficiency?

GM readies to align itself with the Biden administration on emissions and gas mileage rules—and to cooperate with California rather than try to quash it.

Americans anticipate they'll drive more after the pandemic than they did before it—adding urgency to the need for more EVs and clean vehicles.

The Environmental Protection Agency might be led by one by a champion of electric cars, potentially replacing a former coal lobbyist.

A report reminds us that climate change is not a new idea for automakers—even if their electric-car plans are.

GM, Toyota, and FCA were served petitions this week from environmental and consumer groups aiming to stop their fight against tighter California emissions rules.

Amid this week's blackouts, California moved to ban diesel trucks in the future while relying on diesel generators to supplement the grid.