Thanks for everyone's help! She seems to be doing a little better. My fuel log at the start of the thread isn't showing my two most recent fill ups as of 1/2/18, 14:00 MTN. However, on this tank I did make four trips over the mountain near my home (3 mile climb from 4,500' to 6,200', 2nd gear), and my mileage was still better than the previous tank.
I'm going to say any low readings now are from the cold and E10 fuel.
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