Yeah, the jury is still very much out on what the effects of the aeroshell are. The first tank was slightly above average, but that is just one data point. The second tank is in much colder weather and the majority of the driving is with the vehicle not up to operating temperature as my commute to work is extremely short. I also haven't even finished with the second tank, so who knows what it really is at. Qualitatively speaking, the truck feels less encumbered and seems to track more solidly at freeway speeds, so I am pretty sure there is a positive (or negative depending on how you look at it) aero effect.
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