热效率下降导致喷油量添加在平等工况下，冬天车子的耗油量必定要比其他时节高，因为冬天需求的热能更多，发动机有必要多做功才干保持工作温度。即气温造成了汽油的热效率下降。汽油焚烧开释出的热分为三部分：其间约1／3的热量转化为有用功；1／3被冷却水带走；还有1／3在排气时开释出去。也就是说，汽油机的有用热效率为30％左右。
In the winter, the fuel consumption of the car must be higher than that of other times, because the amount of fuel in the winter is higher than that of other seasons. That is, the temperature has caused a decline in the thermal efficiency of gasoline. The heat released from the burning of gasoline was divided into three parts: about 1 / 3 of the heat converted to work; 1 / 3 was taken away by the cooling water; and 1 / 3 were released when the exhaust was discharged. That is to say, the useful thermal efficiency of the gasoline engine is about 30%.
冬天，因为机油黏稠度高，同时发动机机体温度低，导致燃油雾化差，适当一部分燃油未经充沛焚烧就排出去了，没有转化为有用的能量，发动机为确保原有的输出功率，有必要添加燃油喷发量。
In winter, because the oil viscosity is high and the engine body temperature is low, the fuel atomization is poor, the appropriate part of the fuel is discharged without burning, and it is not converted to useful energy. The engine is necessary to add fuel injection quantity to ensure the original output power.
车内热风导致发动机额定做功理论上讲，热风不会发动空调压缩机，仅仅把发动机水箱上的热气送入驾驶室，从而使室内升温。从表面上看，许多人觉得这个热气即便不必也要发生，并没有额定的能耗，也不会额定耗油。其实，发动机水箱的热气的确可以使驾驶室变暖，但如果热气缺乏，不能到达设定温度时，发动机就要额定做功来发生更多热能，好供应驾驶室温度要求，这时就要额定耗油。别的，在充沛热车后刚刚发动车辆时，尽管水温正常，但热气还未发生充沛，如果这时马上打开热风，就会逼迫发动机被动做功，提早供热，也会添加额定油耗。除此之外，冬天雨雪天路滑、路况变差，热车时间过长等都有可能添加油耗。主张车主们平时多留意养成**的养车用车习气。
The hot air in the car leads to the rated power of the engine. The hot air will not launch the air conditioning compressor, only the hot air on the engine water tank is sent to the driver's cab, so that the room is heated up. On the surface, many people feel that the heat does not need to happen, nor does it have rated energy consumption or fuel consumption. In fact, the heat of the engine water tank can really make the cab warmer, but if the heat is lacking, the engine can not reach the set temperature, the engine will be rated to do more energy to produce more heat, so that the temperature of the cab should be supplied, then the fuel consumption is rated. In addition, when the hot car just started the vehicle, although the water temperature is normal, but the heat has not been plentiful. If the hot air is opened immediately, the engine will be forced to do work passively, and the rated fuel consumption will be added as well. In addition, the winter rain and snow roads are slippery, the road conditions are bad, and the time of hot cars is too long. It is advocated that owners should pay more attention to the habit of keeping cars and cars.
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