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Well... if a WAI gave better MPG on fuel injected cars, the car manufacturers would still be providing them. On old cars with carbs, it probably cost them a couple of dollars per car to add the stove and 'thermac'.
It is a good point about cold starts though. Goal is to get the cat lit and the O2 sensor warm ASAP so that the computer can go into closed loop mode. I haven't monitored it on my Alero yet. But on my 2002 Rendezvous, which has the same engine, it takes less than a minute for the computer to switch to closed loop. A WAI wouldn't help this much.
One of the really amazing things when cars switched to EFI was how well the engines ran when cold. I bought my first EFI car ('81 Audi 5000S) in 1983 and never looked back.
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2004 Alero GLS (and a few others)
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