主题：【原创】传说中的“最省油速度存在吗” -- 本因坊幻庵

55 miles相当于 88 km,差不多。

小于55的时候相差不大，但超过之后就非常费油，特别是超过 70mph：

According to studies backed by the department of energy, the average car will beat its advertised MPG at 55 mph. But as the speed increases:

- 3% less efficient at 60 mph

- 8% less efficient at 65 mph

- 17% less efficient at 70 mph

- 23% less efficient at 75 mph

- 28% less efficient at 80 mph