Not bad at all, my 2004 super cab with a regular truck cap an no mods on usually on gets around 12-13, though it is mostly driven around town. My F250 long bed work truck with the 6.2L with the the tool boxes, winch and other things see and average of 11.5 mpg and part of that is highway.
You also need to do this at stop lights, especially when there're many peoples around. It helps if you look down like you're looking for something wrong as whack it open.
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