I read the material as well and will suggest this:
Since the GM patent only used a Chevy short bed and the Texas Tech tested both short and long bed F150's, perhaps the long bed skewed Texas Tech's numbers. Maybe the full tonneau is more suited to a long bed pickup since its length does not obey the 15 degree rule. If the half tonneau was less efficient on the long bed it could pull down the average they used on the graph.
Food for thought?
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He gave me a dollar. A blood-soaked dollar.
I cannot get the spot out but it's okay; It still works in the store
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