Winnebago mpg
Your clutch fan has to be in good working order,or it will drag down the engine.The thermostat must not prevent the engine from reaching design temp or engine oil viscosity will be a constant drag ( SHELL ROTELLA?).I can't tell how much of the grille is "active",however,if there are openings that don't actually direct cooling air onto the radiator,oil-cooler,transmission-cooler,AC condenser,etc.,any of those openings could be safely blocked for a little drag reduction.Also hard to tell,is front bumper.If you look under the front bumper,and its lower edge is not as low as say the front axle bottom,then a shallow airdam could be fabricated to block the air around to the sides of the RV,where its got a straight shot to the rear,a small drag reduction.The rear of the rooftop Coleman air conditioner unit is aerodynamically dirty,but I don't have a quick fix for that(I think such things should be integrated into the body of RVs as they are in ships,airplanes,and cars).Watch those tire air pressures.Don't try and buck headwinds or crosswinds.Take advantage of tailwinds and downhills (not MOUNTAINS!).Accelerate gently through town if traffic will allow it.Try and time the traffic lights as much as possible.Your big frontal area and high drag coefficient are enemies of mpg on the open road.A 5-mph difference in speed will show up at the pump.Uphill grades taken at lower speeds will conserve fuel.Of course,be mindful of the other motorists behind you.I'd almost say that pulling a truly aerodynamically designed trailer,one specifically designed to fit your rig,would offer you the greatest savings,but they don't exist yet.There's just no silver bullet for your project.Your driving style will probably have the biggest impact on your fuel bill.
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