If I install Air Tabs & Solid Aero Hubcaps will I get 10 mpg

This subject, i.e. "gas mileage", when it comes to motor homes always cracks me up. This is one of those things that, if you wanted gas mileage, why did you buy a rolling gymnasium? Go get a Volkswagen TDI diesel, drive at 60 and get 49 mpg and then, hotel it. Otherwise, don't worry about it and have fun.
Scott