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Smaller OEM ones might be more efficient, or they might just be more practical. Like the Fiesta's deflector - it is probably in three pieces so that people can hit curbs without damaging it, or so that snow doesn't collect in it, or something like that.
It is definitely encouraging to see that the mfgs go to the troule of putting even small flat ones on - tells me that even if you can't put a large, streamlined one on, whatever you put on will probably help.
Also notable to me on that Fiesta is the giant, smooth front undertray. Very nice.
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