Nissan has announced that it is partnering with diesel engine manufacturer Cummins to work on a new version of its Titan pickup that could potentially surpass 30 miles per gallon the highway, a previously unheard of figure for pickup trucks.

The Japanese automaker is currently at work on a 2.8-liter four cylinder engine that they hope to use in a future redesign of the Titan. Fuel economy is the main target for Nissan and Cummins, with the two aiming for a target of 28 combined miles per gallon, according to PickupTrucks.com.

Given the discrepancy between city and highway ratings, that likely means that the new engine would be rated at above 30 miles per gallon on the highway. This extremely high figure for a large vehicle would go a long way toward helping Nissan meet stricter fuel economy standards instituted by the Department of Energy.

In addition, the engine is being built with an eye on emissions, hoping to comply with the super-ultra-low-emissions-vehicle standards in California, something that's only been achieved by hybrids thus far.

The two groups are looking to complete work on the engine by 2014, in time for it to be available on the next generation of Titan.

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