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Hi streeter,
Does your Mustange have wheel dams? Look in front of the wheel wells on a Prius, recent Lexus, Fit (others ?). There may be a few more MPG's available. The wheel dams push the air around the tire and wheel house. Which helps prevent some of the air from going into the turbulence within the wheel house.
Don't make em too big. The air flares out wider behind the dam. You just need that air flow to be just wider than the tire when it gets to the tire.
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