No single definition exists for the idea of "green car," and very few shoppers set out to go buy a green car. Instead, car buyers look for vehicles that meet their needs—with fuel economy or energy efficiency somewhere in that list of needs, whether higher or lower. Certainly the definition of "green car" has evolved since this site began... What topic should we have covered less in 2017? Take our Twitter poll
No single definition exists for the idea of "green car," and very few shoppers set out to go buy a green car. Instead, car buyers look for vehicles that meet their needs—with fuel economy or energy efficiency somewhere in that list of needs, whether higher or lower. Certainly the definition of "green car" has evolved since this site began... 
Building a fueling network turns out to be more of a challenge than many advocates, regulators, and drivers may have anticipated. The attempt to boost passenger vehicles fueled by cheap, abundant U.S. natural gas is now essentially over, with a mere 942 public natural-gas fueling stations throughout the 50 states. E85 ethanol, the biofuel that's... 
As they say, the best compromise is usually the one that leaves all parties equally dissatisfied. When it comes to the Environmental Protection Agency's renewable-fuel mandate, it seems regulators have reached equilibrium. The latest skirmish in the long-running battle over the U.S. renewable-fuel standard appears to have been settled, at least... 
Let's say you buy the greenest car you can, one that uses a different kind of fuel, and drive it happily for several years. What happens when the supply of your fuel suddenly ends, and you can no longer fill up your car? That's just what happened to Duncan Chalmers of Seattle, who can no longer conveniently get natural gas to fill up his 2008... 
Since 2007, the Renewable Fuel Standard has required increasing levels of ethanol in gasoline blends sold in the U.S. Most fuel stations across the United States no longer offer pure gasoline, with E10—a blend of 10 percent ethanol and 90 percent gasoline—prevailing. After years of debate, the EPA has now announced it will study the... ![2017 Audi A5 Sportback g-tron (European model), driven, Aug 2017 [photo: Ronan Glon]](http://images.hgmsites.net/tmb/2017-audi-a5-sportback-g-tron-european-model-driven-aug-2017-photo-ronan-glon_100618902_t.gif)
Audi’s vision of future mobility primarily centers around an array of long-range electric cars scheduled to debut in the coming years under the "e-tron" badge. These are intended to be Tesla killers, as they’re often called in Germany. But there’s another kind of tron with a “made in Germany” label as well, and... 
Natural gas vehicles were first promoted starting in about 2000 as a way to reduce reliance on imported oil and cut tailpipe emissions. Their promise appeared to grow near the height of the global financial crisis, when gas prices hovered around $4 per gallon across much of the United States. The domestic fuel promised to cut carbon-dioxide... 
Electric cars may receive most of the attention within the realm of alternative propulsion methods, but liquid hydrocarbon fuels will be with us for many decades to come. The challenge then becomes how to reduce the carbon footprint of extracting, transporting, refining, and burning those fuels to reduce the damage they impose on the environment... 
For almost a century, many people have blamed oil magnate John D. Rockefeller for the demise of ethanol as a viable fuel for internal-combustion engines. He fought its use, the theory goes, to eliminate competition for the gasoline derived from his Standard Oil business—whose descendant companies still extract and sell fossil fuels today...