Some are almost unnoticeable, others make the car shudder each time they activate—but start-stop systems are here to stay. First rolled out in Europe and Asia, where crowded city driving requires cars to spend more time at a standstill, they switch off the engine when the car's not moving. When the driver starts to lift a foot off the brake... Don’t start-stop systems wear out your car’s starter?
Some are almost unnoticeable, others make the car shudder each time they activate—but start-stop systems are here to stay. First rolled out in Europe and Asia, where crowded city driving requires cars to spend more time at a standstill, they switch off the engine when the car's not moving. When the driver starts to lift a foot off the brake... 
Given the current political landscape in Washington, it's not unreasonable to worry about the future of U.S. efforts to combat climate change. The Trump Administration has embarked on an explicit mission to undo all Obama Administration efforts to reduce carbon emissions. Climate-science deniers in the current administration include Trump himself... 
The auto industry tends to oppose, viscerally and viciously, all attempts to regulate any aspect of its products or business operations for any reason. With President Trump in the White House, the industry has succeeded in getting the comment period reopened for the EPA emission standards finalized ahead of schedule, covering vehicles in model... 
A common refrain among critics of current and future fuel-economy standards is that the need to comply with them produces job cuts in the auto industry. It's a theme picked up by President Donald Trump during a much-publicized visit to Detroit last week. In the hometown of the Big Three U.S. automakers, Trump discussed plans to end what he termed... 
The mid-size sedan was once the default for a majority of U.S. car buyers. While the segment's position has been eroded by the rise of crossover utility vehicles of many sizes, these sedans still remain quite popular. Given the number of options available among hybrid mid-size sedans, that should remain the case among buyers who want passenger... 
However you choose to view the 2017 Kia Niro hybrid—Kia says it's a crossover utility, we call it a wagon—it's a good-looking and relatively capacious small car. The debate over segments comes because the Niro has neither the ground clearance of a utility vehicle nor available all-wheel drive, making it more of a wagon or "square... 
One of the challenges of today's uber-polarized political environment is that fear and alarmism increasingly overtake the factual realities of an issue. This appears to be the case with President Donald Trump's Wednesday appearance in Detroit to announce the reopening of the comment period for EPA emission rules for vehicles in model years 2022... 
Automakers may gradually be putting more emphasis on plug-in electric cars and conventional hybrids, but they are far from done with plain old internal combustion. Over the past few years, automakers have applied more technology to a wider array of cars in order to boost their efficiency to meet stricter fuel-economy standards. The most popular... 
The average fuel economy of the new cars and light trucks sold in the U.S. is appreciably higher than it was 10 years ago. The University of Michigan Transportation Research Institute has demonstrated that in its regular reports calculating new-car average fuel economy since October 2007. But researchers Michael Sivak and Brandon Schoettle found... ![The White House, Washington, D.C. [Creative Commons license by dcjohn]](http://images.hgmsites.net/tmb/white-house_100170583_t.gif)
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 place. Last week, executives of 18 automakers sent... 
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 the EcoBoost brand. We'd tested a couple of Ford... 
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 Council for an Energy-Efficient Economy has tried to... 
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 know that the 2017 Cruze Diesel sedan will achieve... 
Donald Trump won the U.S. Electoral College and swept into the White House on a varied platform that included significant promises to cut regulation and reduce government involvement in a wide variety of spheres. The day after his election, the Alliance of Automobile Manufacturers sent him a letter asking that corporate average fuel economy... 
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 year, we have the 2017 Nissan Rogue Hybrid to compete... 
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 output of the larger-displacement engines that they... 
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 pickup trucks in 2014, and revealed a prototype of... 
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 to get in order for consumers to start changing...