The average number of miles a vehicle will travel on a fixed amount of gasoline that is used as a measure of fuel economy.

耗油量;平均每单位燃料的行驶哩数。

An allowance for traveling expenses of so much per mile.

(可数常用单数)(按哩计算的)旅费；旅行津贴。

Length in miles.

(可数常用单数)哩数；哩程。

Advantage, use; service.

【口】利润；效益；用途。