The Chevy Astro that I had, had the same engine and a 4L60E automatic. I was getting 27-28 mpg in a far worse aero package than your S10. I would say your mileage results are very parallel to my results considering how my truck was brick shaped and yours is more sleek. (especially with the aero cap) I would have liked to have seen the results of your finished belly pan with the aero cap as I always thought my van would have gained 2-4 mpg from a belly pan. I say this as I had all kinds of junk hanging under mine....
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