Doesn't torque dictate towing capabilities? I'm talking about JD 6 x 4 Gator engines. The 2 cylinder gas, 18hp, water cooled, 37.7 cu. in., 32.5 lbs-ft, has a towing capacity of 1200 lbs and a hauling capacity of 800lbs. The 3 cylinder diesel, 18hp, water cooled, 40.2 cu. in., 28.9 lbs-ft, has a towing capacity of 1400 lbs and hauling capacity of 1000 lbs. The gas engine has more torque than the diesel, but a lower payload. The 2 vehicles are built identical. Could the real question be a 2 cylinder vs. a 3 cylinder?