restricted average highway speed 限制平均公路速度
70-MPH average highway speed 英里
·2,447,543篇论文数据，部分数据来源于NoteExpress
The EPA's traditional highway test is conducted at an average speed of 48.3 miles per hour and a top speed of 60.
WSJ: Why Your Mileage May Not Measure Up
For the highway number, cars are driven for 10 miles at an average speed of 48 mph.
FORBES: Fuel Economy Sticker Shock
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