Mack Trucks is adding a high-efficiency 13-liter engine and its Mack HE+ package as available options on Mack Anthem models, the truck maker announced Thursday.

Anthems equipped with the MP8HE engine and HE+ package deliver up to a 9.5 percent fuel efficiency improvement compared to a base MP8-equipped Anthem model, and Mack Trucks Director of Product Strategy Roy Horton says the combination is SmartWay certified by the U.S. Environmental Protection Agency.

The 13-liter Mack MP8HE engine uses waste energy from the engine’s exhaust system and converts it to mechanical energy that is delivered back to the engine crankshaft as added

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