NEW YORK (CNNfn) - When you think of diesel engines what comes to mind? Probably loud noises, slow starts and plumes of black smoke.

With the price of U.S. gas near record levels, more motorists are taking interest in cars using alternative fuels that claim to get better mileage. CNNfn's Valerie Morris reports on diesel-powered cars. Play video (Real or Windows Media)

Not these days. Instead, you can think about things like much better fuel economy, longer-lasting engine and better resale value than you get with a standard gasoline engine.

The average gasoline-powered car today gets about 24 miles to the gallon while the average diesel driver can expect to see 30 to 35 miles to the gallon. And, with proper maintenance, a diesel engine can be expected to last for up to 250,000 miles. That's why diesel cars hold their value longer than gasoline-engined cars.

Diesels are popular in Europe, but right now only about 4 percent of passenger cars in the U.S. come with diesel engines. Until recently, only Volkswagen offered them, but Mercedes now offers a diesel version of its E320 luxury sedan. Jeep, like Mercedes-Benz division of DaimlerChrysler, will be introducing a diesel version of its Jeep Liberty SUV this year.

Turbochargers help boost performance, but diesels aren't designed for high-performance driving. And not all gasoline stations, especially away from major highways, have diesel fuel.