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It probably depends a lot on what the rest of the underside of the car looks like. Once I removed my airdam and installed a partial front bellypan, and my mpg went back down to where it was before the airdam, which was about a 2 mpg difference. So the partial bellypan did nothing. In my case it is better to just use the airdam to keep the air out from under the car to start with.
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Winter daily driver, parked most days right now
Summer daily driver
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