We have a Yakima Sidewinder, w/ their towers, crossbars & deflector on the Admiral's, er stoker's, new Honda Fit. (My wife got her Hyundai Elantra totaled last month, and I transferred what I could, which ended up being just the locks, 'winder, & bars [the latter are 48", and Yakima is currently calling for 40" for the Honda][I may end up getting the 40" bars, though].) As for tight fit, there's about an inch clearance between the rear wheel and the the open hatch! Other than that test fit, we haven't traveled with it, but I don't expect any problems on the road. I would add that it's harder to load (at least by myself) as the Honda is taller than the Elantra, and the Sidewinder has to be carried 6-7" further toward the centerline of the car, making it farther reach. So as others have alluded to, we may end up with a small step stool. Or two.
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Jeff
Learn from other people's mistakes. You won't live long enough to make them all yourself.
2004 Co-Motion Speedster
2010 (Specialized) Carmel comfort (my neighborhood bike)
2008 Raleigh comfort (wife's neighborhood bike)