The tires do, in fact, extend a few inches past the car on both sides. This is probably where most of the MPG hit is occurring. Not much I can do about that, but on long trips I may go ahead and remove the bars and velcro to the frame. Sometimes I use an extender for a 2nd bike and I'll bet the bars (and seat for that matter) would have even more effect.
Roof rail delete is on the list of things to do!
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