Fuel Efficiency

Gas prices seem like they are currently out of control, but adjusted for inflation, there was another time when they were even higher. When was that, and what causes gas prices to fluctuate?

By Melanie Radzicki McManus

Automaker Rivian has the potential to disrupt the EV market like no company has since Tesla. But can it dethrone Elon Musk's car company as the dominant maker of EVs?

By John Donovan

The Garden State is the only state in the U.S. where it's illegal to pump your own gas. What gives?

By Sharise Cunningham

Electric school buses are a very, very good idea. They cut greenhouse emissions, for one, but there are several more reasons the U.S. should transition its massive diesel-fueled school bus fleet to electric.

By Stephanie Parker

The next part of Kelly Helfrich's job? Changing their thinking.

By Cherise Threewitt

We've all done it — forgotten to put the gas cap back on after fueling up and then driven off from the gas station. So is it bad for our cars?

By Cherise Threewitt

The newest electric vehicle from Honda is a throwback to the 1970s Honda Civic, with charming headlights and endearing styling.

By Cherise Threewitt

At first it sounds brilliant. But after careful consideration, some dog and auto experts are torn over the safety of this newest Tesla option.

By Cherise Threewitt

Thanks, Elon Musk.

By Cherise Threewitt

The practice of tacking 9/10 of a cent on the end of a gas price goes back to a decades-old tax imposed by state and federal governments. It was supposed to expire but never did.

By Cherise Threewitt

The start of 2019 marks a new era in the world of electric vehicle charging. And that's a good thing.

By Cherise Threewitt

We've all done it – looked down and suddenly realized we're almost out of gas. What kind of wear-and-tear does this put on your car?

By Cherise Threewitt

Does stop-start technology really help with fuel economy?

By Cherise Threewitt

California can — and probably will — change the kinds of cars on the road in the United States. But it's going to take a while.

By Cherise Threewitt

What sets the new electric car apart from its competition, and what features have people so excited?

By Patrick J. Kiger

Scientists created an algorithm that matched people for social, as well as geographic compatibility, increasing rates of carpooling.

By Alia Hoyt

Hey car manufacturers, are you taking notes?

By Jonathan Strickland

The world's second-most populous nation is preparing to make a change, and it could have big implications for business and the environment.

By Patrick J. Kiger

The claims from the fuel additive bottles seem to scream at you from the shelf of your local auto parts store: add me to your tank and I'll make everything better! But do they really do that? Well, it depends on your car and on your needs.

By Cherise Threewitt

Everybody says it so it must be true, right? "Buy your gas in the morning when it's cooler, and it will last longer." Well, the science behind this theory is sound, but in reality, it won't save you much.

By Cherise Threewitt

Car enthusiasts swear that driving a car with a manual transmission is more fun than an automatic. Manuals have also historically boasted better fuel economy, but is that still true today?

By Jamie Page Deaton

Once upon a time, you bought a car with a manual transmission if you wanted to save at the dealership as well as at the pump. But times (and transmissions) have changed — manuals might not be the best at fuel economy anymore.

By Jamie Page Deaton

When is a car like a golf ball? Simple: when it has dimples! Now why, you might ask, would anyone want a dimpled car? As researchers on smart morphable surfaces are discovering, a dimpled surface can actually help an object travel faster and farther.

By Jamie Page Deaton

Fifteen years may seem like a long time, but if automakers are serious about meeting the new Corporate Average Fuel Economy (CAFE) standards, there's not much time to plan a strategy.

By Cherise Threewitt

A diesel-powered car may cost a little more initially, but you'll make up the difference in fuel savings, right? Find out if your diesel-powered savings plans actually add up.

By Kristen Hall-Geisler