汽车工程师们一直都很清楚，设计小排量、重量轻的汽车是满足不断提高的燃油经济性标准最理想的途径。
Engineers have long known that designing smaller, lighter vehicles is an ideal way to meet tighter fuel-economy standards.
事与愿违，这个鼓励并没有发挥混动车的优势，因为混动车在设计时就主要考虑到了频繁起步停车过程时利用汽车发电机制动而将汽车的动能转化为电能储存在蓄电池里面，从而提高了燃油经济性。
Equally perversely, this waiver fails to take advantage of the particular benefits of hybrids, which are built for stop-go traffic where braking recharges the battery and boosts fuel economy.
轮胎设计者因此力求减少滚动阻力以提高能源利用的经济性。
Tyre designers have therefore sought to improve fuel economy by reducing rolling resistance.
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