I had to take my car to the garage for a major service and had to remove the 4 wheel well skirts, outer side skirts, and the underbody panelling beneath the engine bay before I drove it to the garage. Overall I saw a 3-4mpg drop, with a noticeable reduction in coasting ability and an increase in the power level needed to maintain speed. At highway speeds it felt like I was driving in the winter at freezing temps in terms of its power and coasting characteristics. My car looks naked sitting there with its wheels exposed.
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