Just some background info on speed and accessory impacts on MPG, from August's Consumer Retorts:
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Nice, I like the rack with deflector is actually worse than without interesting.
Yeah the deflector is supposed to help with noise but really that's it...
It's also where you can put the most stickers...so there's that too...
It probably had about as much wind tunnel and aero testing as my last haircut.
Unless you've got an abnormally squared-off head, I think your haircut is inherently more aerodynamic than those things. A simple ramp with no tapered rear edge is just a big ol' load of form drag.