I have always adjusted my float height very succssfully for years to improve milege. But I went very lean on my '11 300 and was still getting poor milege and at time hard starting. I was even so lean on the float that I would run out of gas when WOT in the sand.
Anyway what I found was the thin wire that snaps on to the float needle has a slight crown in it and it would not allow the needle to consistently seat. Sure enough when I removed the wire and just ran the needle and float, milege and staating are cured. Just in case others are still stuggling with their ASII it would be something to check.
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