A Bonda portable generator is powering a small travelling fridge (120V) in your RV and consumes 125 watts. The efficiency of the generator's gas motor is 23% and the electrical portion (power head) is more efficient at 91%. If white gas weighs 6.073 lb/gallon, and has a caloric value of 20,400 BTU/lb, how long will the generator run on a tankful of fuel (2.20 gallons).