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that actually looks really cool!
But I really don't think it's meat to help you get better MPG...the point of underpanel is mainly to create downforce, because when the air pass between the underpanel and the ground, it creates a suction effect, therefore sucks the car to the ground, at times, this force can be quite substential. Time Attack cars have seen up to few seconds of improvement from adding an underpanel. so at higher speed, it will actually only make you go slower on straights and lower MPG.
Now...all that is based on my understanding of physics, and track times I have seen on japanese car magzines...
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