Standard power is your choice: a pair of MAND2876LE 401s, producing 700 hp apiece. Or twin Caterpillar C-12s,also 700 hp each. Running in calm water, the 40 Express hit 41.6mph at 2,262 rpm. When we dropped back to troll, idle speed withboth engines at 600 rpm pushed us along at an ideal 9 mph. Oneengine drops that to 7.4 mph. It took a scant seven seconds toplane, and a very respectable 35-mph cruising speed at 1,800 rpmburned a total of 43 gph. Interestingly, dropping that to 25 knotsat 1,720 rpm saved only 1 1/2 gph. Backing down at 6 1/2 knots, theboat handled predictably.