I like their analysis:
and general description (Google translation):
Quote:
This tip is mounted on a pivoting, extended bike rack on our Audi A2 3L.
We looked for a way to get some more baggage to be taken without compromising speed or fuel consumption. With a trailer you can not ride as hard longer. And luggage on the roof creates more drag and thus more fuel.
With this car we drive fairly economical (average 1:30 on diesel). Now we have fuel economy by reducing wind resistance point behind the car.
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