Small, Cool & Powerful

Compact liquid-cooled electric drives help propel the latest generation of a heavy-duty military truck

When the U.S. Army needs to move ammunition and other supplies cross-country, its soldiers often turn to a Heavy Expanded Mobility Tactical Truck, or HEMTT. These four-axle, diesel rigs can carry payloads of up to 13 tons off-road, on steep grades that look better suited for a tank. HEMTTs have little in common with their civilian trucks, except for one thing — they can both benefit from better gas mileage that doesn't come at the expense of power.

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