Fuel Efficiency

Fuel efficiency has become an extremely important topic in today's world because of rising gas prices, the need to cut our carbon footprints, and the need to cut dependence on oil-rich nations. Check out these great articles on fuel efficiency.

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What is my vehicle's air pollution score?

Air pollution and fuel efficiency used to be the last things car buyers considered before making a purchase. Times have changed, and green drivers need to know their vehicle's air pollution score.

What is the emission certification standard?

The goal of the emissions certification standard is to help your car run smoothly and fight global warming at the same time? All you have to do is head to your mechanic for an emissions test.

What is my vehicle's greenhouse gas score?

The United States Environmental Protection Agency can help you choose a car that's environmentally responsible. Do you know your vehicle's greenhouse gas score?

How SmartWay Vehicles Work

You're in luck if you're in the market for a fuel-efficient car, truck or SUV -- there are quite a few options available. But what if you want a vehicle that's a certified environmental performer?

How the Hybrid Tax Credit Works

If you buy a new hybrid car between Jan. 1, 2006 and Dec. 31, 2010, you may be eligible for a pretty significant tax credit. But how do you know if you're eligible? And how do you redeem it?

How Alternative Fuel Filling Stations Work

It seems as though a lot of people are seriously considering the purchase of an alternative fuel vehicle. But have you thought about how you're going to fill it up or charge it when you need to?

How does a gas pump know when my tank is full?

How does a gas pump know when you've got a full tank? Read this simple explanation of the mechanics that cause a gas pump to shut off when the tank is full.

How Aerodynamics Work

Most people never think about driving through a wall; however, drivers do it each and every day -- except the "wall" is actually a wall of air and your car's aerodynamics help you break through it.

Are grease cars legal?

A grease car can save you a lot of money on fuel, but can it also cost you in fines from the government? Why would clean fuel get you into trouble?

Can any car be converted into a grease car?

Grease cars use waste vegetable oil from fryers and restaurants as gas. But can your car become an efficient, aromatic vehicle, too?

How Solar- vehicle Ventilators Work

You know that your car's interior tends to get hot -- dangerously hot -- in the summer. A solar vehicle ventilator would help drivers cool off by using the sun's energy to blow hot air out of your car and draw cooler air inside.

What are fuel mapping computers?

Your fuel mapping computer picks up where your old carburetor leaves off, regulating the air and fuel mix in your engine so it can run smoothly. You don't need to do anything else but drive.

Will a drought affect the price of ethanol?

Corn crops have been exploding to meet the increased demand for ethanol. It may seem like a good thing, but the distinct possibility of permanent drought in several major corn-producing states has given farmers and scientists pause.

Are solar-powered vehicles still a possibility?

We've heard it repeated so often in the past several years -- we're running out of the fossil fuels that power our cars. So why aren't we using solar power to fuel our vehicles?

How the California Air Resources Board (CARB) Works

Since its formation in 1967, the California Air Resources Board (CARB) has created a number of mandates that have shaped the car industry in surprising ways. Do you live in a California emissions state?

What are the benefits of hydrogen-powered vehicles?

Hydrogen-powered fuel cells are already on the streets in some parts of the world. They're powered by the most abundant element in the universe and produce zero tailpipe emissions. Are fuel cells a good solution?

What are the dangers of hydrogen-powered vehicles?

Did you know hydrogen-powered fuel cells are hitting the streets in some parts of the world? They're powered by the most abundant element in the universe and produce zero emissions. But are they dangerous?

Can I really burn used vegetable oil in my car?

Who would have thought that a bottle of cooking oil could potentially solve our energy problems? We could use vegetable oil to power our cars, but there's a long and arduous conversion process involved.

10 Alternative Fuel Ideas That Never Made It Out of the Lab

You might be surprised by some of the alternative fuels mentioned here. Which of these ideas are pure crank science, and which have a real chance to change the world?

What's the difference between a fuel cell vehicle and a hydrogen-on-demand vehicle?

A hydrogen-on-demand system can provide hydrogen for a fuel cell or for an internal combustion engine. But what about claims indicating you can fuel your car with water? Is there any truth to those statements?

How Electric Car Batteries Work

Electric vehicles have been around since the first half of the 19th century; however, until recently, no reliable, mass-producible batteries were manufactured that could make electric cars competitive with gas-powered vehicles. That's beginning to change.

How much extra gasoline would Americans use if daytime running lights were mandatory?

As gas prices spike daily, we're all looking to save money at the pumps. But if your car uses daytime running lights, be prepared to dig deep into your wallet.

Will I get shocked if I drive an electric car through a big puddle?

Both hybrid and electric vehicles use battery packs to power electric motors. Some systems are capable of generating 300 volts or more. Isn't it dangerous to drive these high-voltage cars through deep puddles?

Alternative Fuel Vehicle Pictures

From electricity to saltwater to air, these vehicles run on all kinds of things you'd never imagine as fuel. What might power your car in the near future?

Will lithium-ion batteries power cars?

Could the same type of battery that powers your cell phone power your car? Lithium-ion batteries are much lighter, which could amp the speed of the car. But they're certainly not cheap.