The Universal Postal Service is considering the possibility of putting wind deflectors on the tops of 500 of their long-haul trucks. Three types of deflectors, with the following characteristics, are being considered, using MARR = 10% per year. The table lists all costs per truck being outfitted. If 5% in drag reduction means 2% in fuel savings per mile, how many miles do the trucks have to be driven per year before the Windshear deflector is favored over the other deflectors? Over what range of miles driven per year is Air-Vantage the best choice? (fuel cost is expected to be $4.00 per gallon, and the average fuel consumption is 5 miles per gallon without the deflectors)