Pretty ticked off right now. After about 4K miles of "normal" readings, I got in my car to find the gauge showing about 1/4 MORE gas than when I parked about 4 hours ago. Miles to E has also increased by about 200. Either someone dumped a few gallons of gas into my tank, or my car is screwed up again... And, no more B2B warranty. Not sure I want to pay someone to figure this out, since it doesn't seem to be a known or common problem.
So the above occurred on the 8th, then cleared up a day or two later. A couple weeks (and tankfulls) of normal behavior, but now it's flipping out on me again. Miles to E on midday Friday was about 200. Didn't drive it over the weekend, and by Tuesday morning (about 100 miles later), it displayed 300 Miles to E.
What's frustrating is, this is nothing that a service tech could observe if I bring it in. I think it needs to be diagnosed by someone who is familiar with how the system was designed to work. IMO, that would be the best person to know what might be causing this problem. Service techs are in the dark, and obviously, re-flashing the software is not on its own the fix.