TT with Murphy Bed - Forest River and Venture Sonic

I also like the murphy bed. If we all like the same floor plan we wouldn't have so many choices.
I'm looking at the Sonic 190.

I'm no aerodynamic engineer but there is also a reason manufactures are going to the rounded front roof line. You get better airflow over the top, less drag when your towing. I doubt it would make a huge difference in your fuel mileage and wouldn't let it sway my decision if I found a floor plan that worked for me with the billboard front.