Fuel Efficiency

Just days after the presidential election, automaker lobbyists urged Donald Trump to loosen pending emissions and fuel-economy standards. Shortly after the election, a lobbying group wrote Trump asking him to change or delay an EPA decision that kept planned emissions standards for 2022 to 2025 in...

Smaller engines with turbochargers have spread throughout new vehicles as a way to meet the increasingly stringent fuel-efficiency rules that started in 2012. But no maker has been as forward about marketing that technology as Ford, which now offers a range of downsized and boosted engines under...

Measuring the energy efficiency of a new vehicle is one thing, but ascertaining its overall environmental impact can be more complex. A debate still rages over the overall carbon footprint of electric cars compared to those powered by fossil fuels. But for the past 20 years, the the American...

With the elimination of Volkswagen diesel models, the 2017 Chevrolet Cruze Diesel is one of the few remaining options for buyers seeking a mainstream-priced diesel car. The second-generation Cruze Diesel was confirmed last year, but the initial sedan variant is only just now going on sale. We now...

Just days after the presidential election, an automaker lobbying group wrote Donald Trump asking him to change or delay an EPA decision that kept planned exhaust-emission standards through 2025. Now executives of 18 automakers have sent a second letter, asking the same thing—and echoing a...

Elio Motors continues to drag its feet regarding the start of production for its three-wheeled, two-seat, "84-mpg" vehicle, but it may now be running out of time. The company previously said it had received 55,000 reservations for the car, representing potential sales of $300 million. Last year, it...

As we roll through the second month of 2017, it's once again time to take a look at the best deals on green cars. This month's batch of deals spans a wide array of models, from one of the best-selling plug-in hybrids to a pair of subcompact sedans. It also includes one of the newest green cars to...

The 2017 Subaru Impreza is one of the most fuel-efficient all-wheel-drive vehicles in the U.S. market, and has been for many years. The entirely redesigned 2017 Impreza rides on new underpinnings, but it's easily recognizable as an evolution of the company's popular compact sedan and hatchback. One...

It's one of the most frequent questions asked by shoppers interested in utility vehicles with better gas mileage: why aren't there more hybrid SUVs and crossovers? Following the 2012 demise of the much-loved Ford Escape Hybrid, it took four years for the 2016 Toyota RAV4 Hybrid to emerge. This...

When it comes to improving fuel efficiency, simply making an engine smaller is a fairly direct way to get results. It's the approach that many automakers have taken in recent years. They have downsized engines across model lines, usually adding turbochargers at the same time to match the power...

Regardless of political persuasion, there are some issues almost everyone can agree on. One of them, for example, is likely gas prices. It's hard to imagine anyone who enjoys paying more every time they fill up their car. DON'T MISS: Emissions/MPG rules could cost 1 million jobs, Ford CEO tells...

Along with price, the top-line statistic cited for any battery-electric car is its rated range. Until last month, the only electric cars that exceeded 200 miles in that metric were made by Tesla Motors. Now, the 2017 Chevrolet Bolt EV has a 238-mile EPA rating for range—and that's usually the...

Could a full-size pickup truck ever get a fuel-economy rating of 37 mpg? California-based Achates Power believes it can, and its novel engine uses a design that dates back to the earliest days of internal combustion to do so. The company announced its two-stroke, opposed-piston diesel engine for...

Continuing low gas prices are often blamed for the current popularity of crossover utilities and SUVs, along with any sales struggles green cars may experience. But would a sudden increase in gas prices cause shoppers to flock to more fuel-efficient vehicles? If so, how high would gas prices have...

The differences between gasoline and diesel engines lie not only in their fuels, but in how those fuels are ignited. Gasoline engines use spark plugs, while diesels simply use compression. But it is possible to ignite gasoline in an internal-combustion engine with compression, as in a diesel. DON'T...

Since Ford launched its line of downsized EcoBoost engines in 2009, the "eco" part of that name has often required an asterisk. That's because some owners have found that real-world fuel economy results don't always live up to the vehicles' official EPA ratings. The phrase "you can have Eco, or you...

It's a new year, and that means a new crop of buyer deals on green cars. The 2017 model year is now well underway, but older 2016 versions of certain vehicles still sit on dealer lots. As dealers get more anxious to clear this older stock, look for more aggressive incentives on these models. DON'T...

Cars that run entirely or partly on electricity from a battery pack have no tailpipe emissions, but to judge their overall impact, you have to look at lifetime wells-to-wheels emissions. That includes emissions associated with extracting, refining, and burning the fuel used to make the electricity...

For nearly a decade, the average fuel economy of new cars sold in the U.S. steadily increased—but that moment has stalled in recent years. Low gas prices and increased consumer interest in SUVs has caused calculated average new-car average fuel economy to plateau and, in the case of 2016's...

Several manufacturers are trying to launch new 3-wheeled vehicles, but will they succeed?