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I had another atypical tank over the weekend with lots of stop and go and some idling running AC, but then I had a very normal tank the first part of this week. These two are now my worst and best with the shell respectively. Including both those tanks my rolling average is now up to five tanks showing a 9.58% improvement.
Full disclosure I did check my tire pressures on Sunday, and topped off one low tire. I also pulled off my step/sliders in anticipation of my leaf spring replacement. This only affected my last tank, and comparing that tank (5) to my previous best tank (2) it wouldn't have thrown the final number off much. Honestly the atypically low tank (4) is skewing the number down much more than those changes could skew it up. (I did not have any tanks like that in my 10 tank baseline.)
It may not be ABA accuracy, but taking the good results with the bad results I feel pretty confident calling this a 9.6% +/-2% MPG improvement due to the shell.
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