Fuel Efficiency

The world produces an astonishing amount of olives -- 21.2 million tons, or 19.3 million metric tons, says the Food and Agriculture Organization of the United Nations. It would be a bummer for all those pits to just sit in a landfill.

By Jonathan Atteberry

Instead of relying on futuristic power sources, steampunk-style contraptions look to the past and get their juice from steam. Does steam have staying power as a source of energy?

By Laurie L. Dove

We're still a ways from a hemp-powered car, but industrial hemp has made a number of headlines in past years, especially as an alternative energy source. Is hemp the power of the future?

By Alice Truong

Biofuels -- the word seems magical. It brings to mind singing birds, clear blue skies and global happiness. Somehow, we can turn plants and other organic material into something to power our cars and save the planet at the same time.

By Craig Haggit

Scientists use the term algae to refer to a large and varied group of plantlike organisms often found in water. Like plants, algae are photosynthetic: They convert carbon dioxide into food using the power of sunlight. Could it be used as fuel?

By Chris Opfer

There's no question -- relying on coal and oil for power is a dirty game. Both fuels release greenhouse gases when burned. Both require extensive and sometimes dangerous collection methods.

By Jonathan Strickland

From wood-burning stoves in Sudan to coal-fired power plants in Pittsburgh, most of the world runs on biomass energy -- energy produced using materials derived from living things

By Christine Venzon

There are plenty of arguments for biorefining as the way to power the future, as well as reasons to wonder if we should think twice about the developing energy source.

By Alexander Davies

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

Avoid topping your gas off. Learn in this article why you should avoid topping your gas off.

By Jasmin Malik Chua, Planet Green

Go on any highway and you'll see many vehicles with roof racks. Learn more about your roof rack affecting your gas mileage.

By Michael Graham Richard, Planet Green

Fuel options for the future. Read this article to learn the fuel options for the future,

By Team Planet Green

Fossil fuels (like gasoline and diesel) are running out and getting a bad rap for nasty tailpipe emissions -- and rightly so. Learn more about how green are automotive lithium-ion batteries.

By Kristen Hall-Geisler

During the summertime, it could be said that the hottest moment between is when you first get into your vehicle. Learn more about cooling your vehicle quicking during an intense summer heat and reduce carbon emissions.

By Eric J. Leech, Planet Green

How to tune your own car for better gas mileage. In this article, learn how to tune your care for better gas mileage.

By Eric J. Leech, Planet Green

The average motorcycle gets 35-40 miles per gallon. Learn more about improving your motorcycles gas mileage with these 10 tips.

By Josh Peterson, Planet Green