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Cap versus tonneau really depends on geometry. If the box is so short that flow cannot reattach to a tonneau then a cap should show better MPG (cleaner wake). If the box is long enough that flow does reattach to a tonneau then a cap should show worse MPG (larger wake). There are too many dimensional variations between makes and models of pickups for one-size-fits-all rules to apply. Phil's template is an excellent tool for visual prediction of whether a given tailgate is reattachable or not.
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