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Personally, I'd settle for a commercial operator with plenty of experience and understanding of record-keeping to see if this (or other) was a worthwhile addition. Truck & trailer behavior against winds (all sorts, natural or man-made) alone might make this device worthwhile even though it doesn't answer the question about them, per se.
I suspect that since Wal-Mart is now aero-equipping it's trailers that this device would have shown up. Not to my knowledge, or not at this point. It's cheap enough, after all.
This problem of testing is hardly confined to mpg. On one of the RV boards is the proposal of a test of a weight-distribution hitch's "levelling bars" in one-inch increments (different bar types; different "weight" ratings, etc), and the contention is dozens of posts long well before results are posted.
We'll do the best we can (is how I see it), and submit to "peer review". What we need be mindful of is "consensus" becoming a chokehold (have seen more than one site go to #&$% over "consensus"), as, often, some very interesting voices pop up at one point or another which get discouraged or lost.
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