Quote:
Originally Posted by oldtamiyaphile
I don't know what a CR-Z looks like back there but I sealed a massive gap (12mm or so) at the rear doors of my van with self adhesive automotive seals off eBay:
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There is a possibility that the gaps are beneficial.
During development of the 1st-gen Golf,VW discovered that sealing the gap at the top of the rear hatch increased drag.
They were going to investigate that.(the gap may have acted as a turbulator,allowing more energy into the boundary layer and better flow attachment,or better mixing in the wake).