求翻译：教练车使用时如何省油，教练车省油有诀窍：为了节约能源，不少国家制定了限制教练车油耗的法规，从而促进了燃油经济性的不断提高。随着技术的进步，近年来发动机燃油经济性的提高，教练车自重的降低，教练车空气阻力和轮胎阻力的降低，传动效率的提高，都使汽车的经济性有了大幅度的提高。是什么意思？

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