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... Which alternative fuels will survive long-term? Twitter poll results
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... 
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... ![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... 
Natural gas has not proven popular for vehicles bought by individual consumers, but some fleet operators continue to find it an attractive alternative to gasoline and diesel. That's because the lack of public fueling infrastructure proves a major drawback for natural-gas passenger cars, but fleets can circumvent that by operating their own... 
Last week, the U.S. Department of Energy awarded a $1 million prize to a little-known team for what you might call a new garage appliance. The SimpleFuel team—actually a collaboration of three separate companies—won the prize, first offered in November 2014, for its hydrogen home-fueling station. The goal is to let drivers of hydrogen...