这有个link

来源: 加共 2018-03-02 18:18:06 [] [旧帖] [给我悄悄话] 本文已被阅读: 次 (1031 bytes)
本文内容已被 [ 加共 ] 在 2018-03-02 18:18:50 编辑过。如有问题,请报告版主或论坛管理删除.
回答: 那是因为HWY上少停停走走加共2018-03-02 18:12:20

http://eartheasy.com/move_fuel_efficient_driving.html

Drive steadily at posted speed limits. 
Increasing your highway cruising speed from 55mph (90km/h) to 75mph (120km/h) can raise fuel consumption as much as 20%. You can improve your gas mileage 10 - 15% by driving at 55mph rather than 65mph (104km/h).

Note how quickly efficiency drops after 60 mph.

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