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A good question Puddelgum and one which I am sure is not considered much if at all by many discussing fuel economy and aerodynamics.
Cross winds have two effects in the main.
The first being to expose more of the vehicle surface area to the wind , and the second being to change the (ideally) smooth flowing air into a torrent of turbulence on the side opposite the side being attacked by the cross winds.
How much this second factor damages aero varies a huge amount and I am not sure there are any numbers out there to help even get into the ball park.
Pete.
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