Regarding gas mileage, speed is one of the most important aspects to consider. Air resistance affects gas consumption directly proportional to speed. For instance, doubling the speed from 40 mph to 80 mph would quadruple the drag force.
Unlike hitch-mounted systems, roof-mounted bike racks are more difficult to remove. They may require the use of tools to remove. Also, wind noise may be a problem. It can affect your gas mileage. Furthermore
A great feature of a rooftop bike rack is full trunk access. While it might be difficult to reach your bikes from the back of the car, the rack keeps them upright. The Thule UpRide makes
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