Diesel electric. Use my Dodge PU as an example. Take the Cummins out (1200# long block), put in a little Kubota 3 cylinder that sips diesel like a mouse. Add 1 60 HP DC electric engine (equals the 600 FT Pounds torque 0-1800 rpm)....add truck batteries as needed, it can easily carry 2500# of batteries.

I'd bet you'd get 100+ miles to the gallon of diesel easy.

Notice the Army is going all D/E now in EVERY form of ground transportation.