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The air dam was among my top three mods for fuel economy, along with increased tire pressure and HX wheel swap.
It would be fairly safe to say that an airdam would improve the fuel economy of an average vehicle by 2%-6%. Results will vary from vehicle to vehicle. Generally speaking, the smoother the underbody of a car is, the smaller the effect from an air dam. If your underbody is completely smooth, an air dam may actually hurt your fuel economy.
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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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