When I was 4 years old and the family took a trip to Florida in a 1958 VW Beetle. Dad strapped a rack to the roof which held 2 suitcases. The top speed dropped from 60 MPH to 45 MPH. The exception was only when he could draft behind a truck, then the top speed was whatever the truck was doing.
Learned about aerodynamic drag, under powered cars (36 HP), and diesel fumes all on the same trip!
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