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I built one over a month ago and have over 2000 miles on it. It has been good for a 12.5% reduction in Cd and a 6% increase in FE at highway speeds (over 60mph). It is considerably longer than what I see you going for, mine is 4' at the longest point, and extends past the end of my car. I think MetroMPG had about 3% gain on his initial kammback for his Firefly (about 2' long). Expect a 3% (estimate) gain in FE, a 6% drop in Cd, and a 600% increase in attention paid to your car.
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