The 2019 Ram 3500 now gets 400 horsepower and 1,000 pounds-feet of torque from its Cummins high-output diesel, but what does that mean for fuel economy? We took a Ram 3500 Limited 4×4 crew-cab long-bed dual-rear-wheel pickup truck for two fuel economy runs to find out.
The Cummins engine remains at 6.7 liters of displacement and uses the same design and layout as before. However, there have been many improvements. The block is now made of compacted graphite iron to save weight (60 pounds) while retaining strength, and there’s a new cylinder head design, new valves, springs, rocker arms, pistons, rods, bearings, exhaust manifold and updated turbo. To accommodate the higher power output and load ratings, Ram upgraded the transmission, frame, suspension, brakes, axles and transfer case.