In contrast to Formula 1, passenger cars tend to create lift at medium and relatively high speeds, because of their shape. As this relieves the load on the axle and reduces the driving stability, and therefore also the safety, designers aim to keep the lift as low as possible by creating minimal air resistance. This takes a lot of detailed work in the millimeter range. It ranges from smoothing down the underbody to optimising the airflow through the wheels and even to working on integrated rear spoilers. That is the only way to achieve drag co-efficient values under 0.30 while at the same time minimising the lift on the rear axle. However, anyone travelling with roof storage or a bike rack will completely undermine all that meticulous development work.

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