The designers have sacrificed speed for fuel economy.

设计者为节省燃料牺牲了速度。

《牛津词典》

Breaking with convention, Honda's engineers positioned the engines above the wings rather than below, allowing for greater speed and fuel economy and a roomier cabin.

本田的工程师们将飞机发动机安放在了机翼上方，而非下方，这使得飞机速度更快、耗油更低，同时机舱也更为宽敞。

youdao

The bus Train, a dual-mode vehicle that has the versatility of a bus, the speed of light rail and fuel economy vastly better than either.

公交火车，一种双重模式的机动车，即拥有公交车的功能，也具有轻轨的速度，甚至是比两者都还节省燃油。

youdao

The eight-speed gets better fuel economy and performance because its gearing allows the engine to work less at highway speeds.

WSJ: Hot Wheels: Cadillac to challenge BMW with CTS

Developers will have access to APIs that can interact with the car to grab info about speed, performance, fuel economy and other interesting metrics but are locked out of anything potentially dangerous.

ENGADGET

Chrysler promises its new nine-speed transmissions will improve its highway fuel economy on the order of 10%.

WSJ: Ford C-Max Hybrid Energi: The Bawdy Electric