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Because the purpose of AWD isn't to win races on tracks with perfect conditions, it's purpose is for increased traction in non-perfect conditions.
On a snow covered track, AWD cars will beat comparable RWD cars all day long.
On a normal track, the extra weight, and bigger drive train loss will be big disadvantages against a traditional RWD platform. Think of AWD and RWD as different tools for different purposes and it makes sense. You use a hammer on nails, and a screw driver on screws, and not vice-versa for a reason.
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'13 Audi A6
'07 Porsche GT3 RS
'08 BMW E90 335i
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