求翻译：3) the use of the coach car semi-trailer towing vehicle trailer coach car, although the increase in total vehicle fuel consumption, but allocated to the fuel consumption per ton of cargo down. After towing trailer fuel savings for two reasons: First, after the resistance increased with trailer, engine load rate is increased, fuel consumption rate of decline; Another reason is the quality of the train car utilization factor (ie, quality and vehicle curb weight of the load ratio) increases.是什么意思？

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