I put a pair of Kayaks on my Civic hybrid to drive to the lake near my dad's house. I made ~48mpg getting to his house (11.5 hour drive). Going from his house to the lake and back (1.5 hours) with the Kayaks on, the drag was so great I had to use 4th gear to maintain 60mph on the backroads without flattening my hybrid battery... I made about 35 mpg.
Huge difference. Note: I had an aero-clean car (no rack) for the drive to his place, the Kayaks were put on one of those gutter strap-down roof racks he had at his place.
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