At a bit after 6:00 in this video, Bill talks about the aero development. There's about 40 minutes of video. I didn't watch the whole thing, I suspect it's the presentation I'm thinking of where he talks about the real vehicle test.
(I found an old thread where I mentioned the model tested at .26, and the Bendix testing got .29. (.295 is mentioned a few places - probably the number they got.) I think that information may be buried at the Vixen Owners Group website, which has content only available to members now.)
Only other motorhome I know of that spent time in a real wind tunnel is the Vesta/Trip. I've never seen any images or data from anything else.