You're welcome but don't expect great MPG with the bikes on though. The first photo was a vacation trip from MD to NC about 6yrs ago, three bikes no kids (they flew in later with mom). MPG was not that great, but I wasn't doing 65mph either - I believe I posted a trip report here.
The last two pics are more recent, when I took my daughter back to school on labor day weekend, from MD to Rochester, NY. One bike, drove more sensibly (I think I'm getting old) and I actually did 18mpg average. Coming back was no different, even with extended stints at 90 - 95 on the PA turnpike. Noise is actually quite acceptable with summer radials. With winter tires on, the noise from tires combined with roof rack hardware can be annoying.