Very interesting, I hope your experiment solves your noise and bugs issue. Anxious to hear the follow up info.
I went the air deflector route and it has worked out better than expectations by reducing bug splat to 5 or 10%, and wind noise is the same with or without camper. Before installing air deflector the noise was so great that my wife and I would have to yell to each other. I have never tried checking mpg numbers as I believe it takes approx. 10000 miles to get proper average mpg with a TC. I really don't want to go that far with all the wind noise.
2002 Dodge 3500 2wd dually, cummins, 4.10 gears, 10500gvwr, Rancho 9000's shocks
2005 Bigfoot 259.6E, 80watt solar, eu2000 Honda gen., 2x group 31 AGM bats., 7100 btu aircond, electric rear step.