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Old 08-12-2019, 04:15 AM   #3 (permalink)
Join Date: Aug 2008
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Originally Posted by maczo View Post
..... keeping roof racks mounted on 2 square-backs (VW Transporter, Chrysler 300C) actually had positive effect on fuel economy.
..... does anyone here know of any way this could actually be true?
Can't say about roof racks. But in the 60's, there were "wind guards" with curved surfaces, that were put on the roof top rear of station wagons, to direct air, downward over the rear window that kept the rear window clean.
One extra aerodynamic plus, was the air directed downward, helped kill the vacuum on the end of the car..... & MPG went up.
Such a device would really help kill the vacuum on square-backs. Also, vertical curved surfaces on the rear sides, directing side air into the rear vacuum area would also help lessen the vacuum & raise MPG.

Last edited by litesong; 08-12-2019 at 04:23 AM..
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