Advantage The combustion temperature of diesel engine is higher than in a spark-ignited gasoline engine, producing a higher thermodynamic efficiency(> 30%) Diesel fuel has about 10% more Btu per gallon than gasoline Low Co emission due to an excess of air(and oxygen in the combustion chamber Disadvantage. Greater noisiness, initial cost, and weight Harder starting in cold weather Characteristic odor and visible smoke Greater emission of nitrogen oxidesAdvantage: • The combustion temperature of diesel engine is higher than in a spark-ignited gasoline engine, producing a higher thermodynamic efficiency (> 30%). • Diesel fuel has about 10% more Btu per gallon than gasoline. • Low CO emission due to an excess of air (and oxygen) in the combustion chamber Disadvantage: • Greater noisiness, initial cost, and weight • Harder starting in cold weather • Characteristic odor and visible smoke • Greater emission of nitrogen oxides