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Good point that they only cause drag for the most part. The 911, though, was an exception. Porsche found that they had better high-speed stability and better top speed due to reduced drag, which made it a real "win-win".
The high-speed stability is not of interest to us (most cars are quite stable enough at sub-60 MPH speeds anyway), but the reduction of drag certainly is of interest.
Mostly I'm pointing out that there are a lot of factors that go into deciding if a spoiler would help or hurt fuel efficiency, and that in at least one case it helped. Even though chances are pretty decent that it will actually reduce FE on most cars.
-soD
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