*only been used with propane * (gas tank has not been used) - Power Output (Gasoline): 10,000 starting watts and 8,000 running watts. - Power Output (Propane): 8,500 starting watts and 6,800 running watts. - Engine: DuroMax 439cc OHV (18 horsepower) engine. - Run Time: Up to 10 hours on a full tank of gasoline (8.3-gallon capacity) at 50% load; roughly 8.5 hours on a standard 20 lb propane tank. - Outlets: Includes standard household outlets, 30-amp RV outlets, and a heavy-duty 50-amp transfer switch-ready outlet. - MX2 Technology: Allows you to get maximum power from each 120V receptacle or run 120V and 240V simultaneously. - Start Type: Electric start with a backup manual recoil cord. - Compliance: 50-state approved (EPA and CARB compliant).