Fuel Efficiency

Fleet data shows that electric cars have greater range loss in cold weather than their gasoline counterparts.

Domino's is converting Chevrolet Spark hatchbacks into pizza-delivery vehicles.

Gas-mileage ratings are rising every year in virtually every vehicle segment, but most buyers expect smaller cars to deliver the highest numbers of all. That's true, to a point, although minicars like the Smart ForTwo two-seater and the Fiat 500 tend to be rated lower than longer and more...

The Union of Concerned Scientists revises its carmaker emissions rankings in light of the Volkswagen diesel scandal.

Toyota hopes to virtually eliminate carbon emissions from the cars it produces by 2050.

Carmakers want to cut off public access to their software, potentially hampering important independent research.

The 2016 Toyota Prius hybrid has made its world debuts and should arrive at U.S. dealers starting around January. But specific details have been surprisingly sparse. Yesterday, Toyota released a few specifications at an event in Japan. Now, we've learned more about the car's different trim levels...

Average new-car fuel economy in the U.S. fell 0.1 percent in September, researchers say.

Diesel engines may be suffering in the public eye due to the scale of the Volkswagen diesel-emission cheating scandal, but luxury carmakers are pushing forward with plans to boost overall fuel efficiency by fitting more of them to pricey premium models. No maker has a more ambitious diesel program...

Mazda will unveil a rotary-powered sports car concept at the 2015 Tokyo Motor Show.

The amount of fuel saved per vehicle is more important than the fleet average, new analysis claims.

We occasionally run articles about "forbidden fruit," or cool and desirable cars sold overseas that aren't available in the U.S. With Honda down to a single hybrid vehicle for the 2016 model year--the aging and low-volume CR-Z two-seater--it turns out one reader is looking covetously at the...

EPA chief Gina McCarthy says the agency will make greater efforts to stop cheating.

Mazda says its next-generation SkyActiv engines will achieve a 30-percent boost in efficiency.

Start-stop systems in certain 2016 Cadillac models will use ultracapacitors for better performance.

For green-car fans, the all-new Volvo XC90 seven-seat luxury crossover is most notable for its upcoming plug-in hybrid model. But that version will be just a small part of its sales, of which a majority in North America will have the company's supercharged and turbocharged Drive-E engine. The...

Bosch claims its new mild-hybrid system can increase fuel economy at a relatively low cost.

Automotive engineers are very good at incremental improvements to existing technologies, and that skill will be much tested in meeting increasingly stiff fuel-economy rules between now and 2025. For the 2016 model year, Chrysler has extensively re-engineered its Pentastar V-6 engine, a mainstay...

The new 2016 Toyota Prius hybrid made its debut in Las Vegas Tuesday evening, where 350 guests watched the latest model of the world's most popular hybrid car raised into the night sky at an elaborate event to mark its global launch. But "it's not just about MPG any more," according to the press...

The 2016 Scion iM compact hatchback is the second two of new Scion models for 2016, joining the iA subcompact sedan. It's part of a much-needed new lineup that takes Toyota's youth brand away from funky "tall box" cars or 10-foot-long urban cars and gives it a product that competes in the heart of...