剛看了凱美瑞尊瑞的長測文章，其中有一篇《凱美瑞尊瑞長測（10）發(fā)現(xiàn)：高速油耗果然不“低”》。

其中YYP的結(jié)論本來是尊瑞的高速油耗并不比常規(guī)動力低多少，但看網(wǎng)友的回帖，卻發(fā)現(xiàn)不少人認為，混合動力的城市油耗低于高速油耗，并煞有介事的稱，“北美數(shù)據(jù)顯示，豐田混合動力車的市區(qū)油耗比高速油耗低”，簡直讓人笑噴了！

讓我么先看看Consumer Report的油耗測試數(shù)據(jù)，然后再來討論這個問題。

請告訴我，根據(jù)北美數(shù)據(jù)顯示，有哪輛混合動力車的市區(qū)油耗比高速油耗低了？

其實，混合動力省油的秘訣在于：在路況擁堵的情況下，相對于普通燃油車省油，而不是比自己的高速路況省油。

另外，有網(wǎng)友稱EPA測試的數(shù)據(jù)顯示，普銳斯的城市油耗低于高速油耗。EPA的測試結(jié)果確實如此，但Consumer Report也有不同的解釋。并且專門做了一個表格，表明CR數(shù)據(jù)與EPA數(shù)據(jù)的不同。CR是這么解釋的：

EPA estimates don’t always reflect real world driving performance largely because they are based on outdated tests designed to measure vehicles with conventional powertrains in particular driving situations rather than today’s increasingly sophisticated gas/electric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?jīng)]有，EPA測試的城市油耗是在非常低的速度，輕柔加速等適合Hybrid的工況下測出來的。高速油耗測試是在最大100kph，平均77kph的時速下測出來的。反之，CR測試更符合實際駕駛的情況，高速巡航速度穩(wěn)定在100kph以上，車子更多的由內(nèi)燃機來驅(qū)動。很顯然，CR的測試數(shù)據(jù)比EPA的數(shù)據(jù)更貼近現(xiàn)實。

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