From what I've read, both the wagon and 5-door have a Cd of 0.32. One article noted that the wagon actually has a slightly lower drag coefficient, actually.
I would take the manual as mentioned, but all things being equal, the convenience of the wagon would trump the extra weight. It all depends on your needs -- the wagon is a rare find...
RH77
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“If we knew what we were doing, it wouldn't be called research” ― Albert Einstein
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