By 2008, China's highway mileage reached 3.73m km, an increase of 45 times over 1949.

截至2008年底，中国公路通车里程达到373万公里，比新中国成立初期增长了45倍。

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In 1949, China had a highway mileage of only 80700 km, with 30000 km paved.

新中国成立初期，我国公路通车里程仅为8.07万公里，有路面里程3万公里。

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In recent years, China's rapid development of highway construction, high grade highway mileage increase rapidly.

近年来，我国的公路建设飞速发展，高等级公路通车里程快速增加。

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You might note, with an eye roll, that the Smart iQ's highway mileage of 37 mpg is bested by many larger cars, including the Chevy Cruze Eco and the VW Jetta Sportwagon diesel (both rated at 42 mpg on the highway).

WSJ: 2012 Scion iQ Review: Slow, Whiny, Tiny��but Great to Park | Rumble Seat by Dan Neil

For roughly half the price of the Volt, you can get the Cruze, a car that promises better gas mileage on long highway trips, when both are running on petroleum.

WSJ: Is Chevy's Cruze Dulling the Spark of its Volt?