Fuel-saving Devices

Does stop-start technology really help with fuel economy?

By Cherise Threewitt

A flex engine sounds like some sort of futuristic motor, but you'd be surprised how long this technology's been around. Is it greener or more efficient than a gas-guzzling engine? Flex your brain muscle and find out.

By Nathan Chandler

Improving mileage is only one part of dealing with rising fuel costs. Some cars can accept gas blended with ethanol. But how does the vehicle adjust to the switch?

By Melanie Radzicki McManus

Personal rapid transit systems offer a public transportation option that's a bit more comfortable than the average subway or bus. In what ways is a pod car like your own car?

By Clint Pumphrey

There’s a saying about sports cars: They can pass anything on the road -- except a gas station. Here are 10 sports cars that break the stereotypical gas-guzzler image.

By Christopher Neiger

Running a car on compressed air isn't exactly a new idea. In fact, the technology dates back to the early 1930s. So what makes Magnetic Air Motors' magnetic air car unique?

By Kristen Hall-Geisler

They said it couldn't be done: No one could build a car capable of traveling 100 miles or more on a single gallon of gasoline. They were wrong.

By Akweli Parker

By 2025, it's quite possible that the average passenger automobile will be capable of getting more than 50 miles per gallon (21.3 kilometers per liter) — if it runs on conventional fuel at all.

By Akweli Parker

During times of rising gas prices, which seems to be all the time, vehicle owners are on the lookout for a well-priced product that can save them a few dollars in the long run.

By Christopher Neiger

By 2025, the Obama administration would like to see the average vehicle rated at 54.5 mpg, or 37 mpg on a window sticker. Considering that the industry has made just over 2 percent gains a year since 2007, this is no small feat.

By Kate Kershner

To make natural gas a viable fuel for vehicles, it must be compressed. This allows more fuel to be stored per volume, among other things. How much do you know about natural gas?

By David DeFranza, Planet Green

Anyone who's seen the famous, grainy footage of the Hindenburg disaster is familiar with the idea that hydrogen ignites easily. Burning unlocks stored energy, making hydrogen useful as a fuel.

By Josh Clark

Natural gas generators, as the name suggests, use natural gas -- which includes the propane used for backyard grills or the methane that utilities supply through underground lines -- to generate electricity.

By Matt Cunningham

Instead of burning fuel like conventional engines, hydrogen fuel cells work through an electrochemical process. To produce electricity, hydrogen atoms are ionized on one side of an electrolyte membrane. How much do you know about hydrogen fuel cells?

By Gallagher Flinn

Why fuel additives won't improve performance and gas mileage. Learn why fuel additive won't improve proformance and gas mileage in this article.

By Eric J. Leech, Planet Green

For as long as we've complained about gas prices, there's been an army of inventors offering devices to stretch our mileage further. But which ones work and which are hoaxes?

By Matt Cunningham

Mileage-boosting gadgets have been around for years, and they seem to make a comeback every time gas prices spike. But do any of them actually work?

By Matt Cunningham

Fuel prices are on the rise, and with gas getting so costly, those fill-ups are no trivial expense. What can you do to help your vehicle save fuel?

By Becky Striepe