Did MythBusters really say that pickup toppers do nothing for gas mileage?

Recently I came across this video:

Now they did say it did have some improvement at the end. But notice how they used a hard tonneau cover in their test run. They never used a camper top.

But they also said that driving with a pickup topper did NOT hurt mileage. No Tailgate, Tailgate up and pickup topper were about the same!

But who knew that using a tailgate mesh would get the best mileage!

 

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