在多坡地形行驶时，如果出现不必要的第三档和第四档之间的换档情况，而你可能还要关闭定速巡航功能，这种没有必要的切换形式会导致燃油经济性的降低。

You may want to turn off the speed control in hilly terrain if unnecessary shifting between third and fourth gear occurs. Unnecessary shifting of this type could result in reduced fuel economy.

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