Chrysler says its new diesel-powered Ram pickup will have the best fuel economy in its segment.

The automaker cites government fuel-economy numbers released Tuesday that show the Ram 1500 with a 3.0-liter diesel V6 engine getting 28 miles per gallon on the highway and 23 mpg in combined city and highway driving.

That beats the current leader, the Ram 1500 with a gas-powered V6, which gets 25 mpg on the highway. It also beats some smaller trucks, including the Toyota Tacoma.

Ram is the first to offer a turbo-diesel engine in a half-ton pickup. It's expected to arrive in dealerships next month.

Nissan also says it plans a diesel version of its Titan pickup.

The diesel-powered Ram will cost just over $30,000, around $4,500 more than a base gasoline model.