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Let me try this again. I am NOT seeking help with trying to get better gas mileage. I have already decided what mods I can live with based on my driving needs. The only question I am asking for help with is trying to reduce the amount of dirt that collects to the rear of my 2008 Scion xB. I don't want to redesign the complete rear of the car adding a 4 foot tail or similar type of contraption. I am just trying to find an EASY way to try and keep the dirt off the rear by maybe deflecting the air away from the low pressure area behind the car. Years ago many station wagons has a deflector on the rear of the roof that I thought might be there for that reason.
Al
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