it looks like the center section might not stick down much more than where the bumper is already. where its lower on the outer edges, it might have a little boat-tailing affect behind the tires, however it continues inboard too far for that purpose. where i think you would get some of the parachute affect.
for efficiency, id say no
if you think it looks awesome and makes you happy, do it. i doubt you would notice the loss in mileage if any
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