I have roof rails (what SSD calls hybrid rails, not the factory style rails) on my 2014. They come on and off in less the ten minutes using a single wrench. I did not notice any MPG difference when I installed them BUT if I load it up with a brick, any movement above 50 makes a serious dent in the MPG.
As for the hitch bike rack, did you look at Old Man Soul's threads on his bike rack?
As for the hitch bike rack, did you look at Old Man Soul's threads on his bike rack?