AWD in cx5 and the use of wiper.

Getting back to the original question about the impact of greater AWD activation on fuel economy, I would also suspect that the increased drag from the wet road would probably have a greater impact on fuel economy than the increased torque going to rear wheels?
The effect of wet road depends on many factors, including vehicle speed, tire tread, texture of the road surface, and depth of the water. A slightly wet road actually has less rolling resistance than dry road (water acting as a lubricant), but deep water would have more resistance (like trying to walk through a swimming pool). Years ago I saw some research data about this topic, but I don't recall the source.
 
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