To be honest, I can't really see it helping. Adding the fenders to the front will make the airflow past the fender no longer attached, which will reduce efficiency. In the rear, adding skirts doesn't improve economy by that much, and adding the frontal area will likely just reduce mileage.
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2013 Toyota Prius C 2 (my car)
2015 Mazda 3 iTouring Hatchback w/ Tech Package (wife's car)
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