Throughout the diesel engine’s rich history, it was always the domain of semis and light-duty pickup trucks, but American consumers are giving it another look. This is because manufacturers—such as Chevy and Nissan—are starting to use them in passenger cars. Additionally, consumers see diesel as a way to get better mileage without buying a hybrid. So, which is better—a gas or diesel motor? The answer depends on what you want the motor to do, and there are pros and cons to both.

Mileage

Wide-open driving with few stops is where the diesel engine’s efficiency and mileage capabilities shine. So, for drivers who put on mostly highway miles, a diesel-powered vehicle is the best option. If you do a lot of city driving or commonly drive in high-traffic areas, a gasoline engine is better. In general, a diesel engine is more efficient than a gas one and burns less fuel. It also burns cleaner and produces less waste and emissions because diesel fuel has more energy than gasoline and can deliver better efficiency.

Cost

Up front, the same model of diesel truck will cost more than a gas one. They also cost more to own and maintain. Constant fluctuations in gasoline and diesel fuel prices tend to keep both in the same neighborhood, but diesel is usually a little more expensive. In the long term, a diesel engine may end up saving you money because of its durability and fuel economy. A diesel engine is just breaking in around 150,000 miles; this is typically when a gas one nears the end of its life. There is also a better resale market for diesel trucks because of their longevity. This means you’ll likely get more money for your vehicle when it comes time to sell or trade it in.

Power

A diesel motor has more power that its gas counterpart. Trucks haul tens of thousands of pounds in cargo all over the world—they need the power and longevity that a diesel engine provides. The amount of torque a diesel engine creates gives it its advantage, not the horsepower. If you plan on hauling heavy loads frequently and at great distance, then diesel is the way to go. However, if you need to haul a trailer across town, then a gas engine will do the job just fine.

There is no right or wrong answer when choosing diesel or gas, and your decision may come down to personal preference. Know what you need out of the engine before you make a purchase; long hauling is the domain of diesel, and quick trips are for gas. In the end, how you intend to use your vehicle should determine which one you buy.