What's the difference in fuel consumption between 2WD and 4WD?

What are the differences between 2WD and 4WD? Thanks.

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What's the difference in fuel consumption between 2WD and 4WD?

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I heard that the fuel consumption of the 4WD petrol version is higher than the 2WD. How much higher is it? Can the 4WD version switch to economy mode to achieve full 2WD?

I have a question for the owners of the 4WD version of this car. Today, I asked a friend if setting the 4WD selector to 2WD on the Outlander Sport makes the fuel consumption the same as the 2WD version. He said no, even if you set it to 2WD, there's still some power loss, and the fuel consumption is higher than the pure 2WD version. Is that true, folks?