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A small update, I took the underbody panels off and my mileage is now back into the mid 60's. So it looks like putting those covers on the bottom is dropping me up to about 4mpg. I never would have guessed that is what caused my slight drop in mileage. I assumed it was some oddball problem like a dragging brake or something I just wasn't able to find.
So for now back to a regular underside with my ventilated back bumper. I will have to get the car in the air sometime and try and figure out why it was worse with the underbody panels than without. I would think that at worst it just would not gain mileage but I never expected it to be that much drag by smoothing the underside.
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