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I've got Yakima which has round bars, instead of the flat front surface of a Thule. A little impact on MPG with the rack empty, its mostly the...
Yakima is the way to go for quality and flexibility both. Q-Towers also can go on and off, and consumers install these at home routinely....
It's not your rack that needs the tie down lines, its your gear! The upward pressure from the air off your windshield is huge, especially at 60+...