It takes a man 12.5 hours to complete a 500-mile trip in his automobile, during which 18 gallons of gasoline are consumed. during this trip, the average emissions index for carbon monoxide is (ei)co = 28 (gm/s)co / (kg/s)fuel. the density of liquid gasoline is 0.692 kg/l. calculate: fuel economy in english units. [mpg] fuel consumption rate using standard si units of l/100 km. amount of co emitted to environment during trip. [kg]