My personal tests indicate tailgate up achieved slightly higher MPG then
tailgate down, although it was probably not significant (0.4MPG). Here's
some info on the subject from The Car Guys, Click & Clack:
http://cartalk.cars.com/Columns/CC/CC7237TXT.html
'92 Dak CC 2wd 318 3.55
'84 GoldWing Interstate
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