刚看了凯美瑞尊瑞的长测文章，其中有一篇《凯美瑞尊瑞长测（10）发现：高速油耗果然不“低”》。

其中YYP的结论本来是尊瑞的高速油耗并不比常规动力低多少，但看网友的回帖，却发现不少人认为，混合动力的城市油耗低于高速油耗，并煞有介事的称，“北美数据显示，丰田混合动力车的市区油耗比高速油耗低”，简直让人笑喷了！

让我么先看看Consumer Report的油耗测试数据，然后再来讨论这个问题。

请告诉我，根据北美数据显示，有哪辆混合动力车的市区油耗比高速油耗低了？

其实，混合动力省油的秘诀在于：在路况拥堵的情况下，相对于普通燃油车省油，而不是比自己的高速路况省油。

另外，有网友称EPA测试的数据显示，普锐斯的城市油耗低于高速油耗。EPA的测试结果确实如此，但Consumer Report也有不同的解释。并且专门做了一个表格，表明CR数据与EPA数据的不同。CR是这么解释的：

EPA estimates don’t always reflect real world driving performance largely because they are based on outdated tests designed to measure vehicles with conventional powertrains in particular driving situations rather than today’s increasingly sophisticated gas/electric systems. In fact, according to Mike Duoba, a research engineer at Argonne National Laboratory who works on keeping the tests up to date, the EPA tests “were originally designed to test emissions, not fuel economy. They wanted to test a variety of speeds and accelerations.”

The EPA test for city fuel economy is conducted at very low speeds, with gentle acceleration and minimal idling. The highway test includes quite a bit of stop-and-go driving, with a maximum speed of 60 mph and an average speed of 48.

Hybrids are most efficient in those conditions. With a light foot on the throttle, the latest models can often cruise in electric mode up to about 60 mph, so they can perform portions of the EPA tests without consuming a drop of gas. By contrast, Consumer Reports’ highway mpg tests are performed by driving at a steady 65 mph, reflecting a driver cruising on an interstate highway. In that situation, a hybrid is constantly running its gas engine, so it doesn’t get the full benefit of using its electric power. Thus, it gets fewer mpg than in the EPA test.

看到没有，EPA测试的城市油耗是在非常低的速度，轻柔加速等适合Hybrid的工况下测出来的。高速油耗测试是在最大100kph，平均77kph的时速下测出来的。反之，CR测试更符合实际驾驶的情况，高速巡航速度稳定在100kph以上，车子更多的由内燃机来驱动。很显然，CR的测试数据比EPA的数据更贴近现实。

http://www.consumerreports.org/cro/magazine/2013/08/the-mpg-gap/index.htm