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This Cummins ISV 5.0 V8 diesel engine generates 275 horsepower and 560 foot-pounds of torque (to the wheels). It fits where a gas engine would go and weighs about the same. Cummins says fuel economy is 20 to 40 percent better than a a gas V10 engine. This Cummins ISV 5.0 V8 is designed for 28- to 32-foot motorhomes.