I've not had this problem in 13,000+ miles. That's at least 40 fill ups. I do not top off ever, just go until the pump stops. I fill up when I'm almost empty or know I need more fuel for a trip. My lowest point refill was showing 5 miles remaining. Most of the time I'm showing around 30 miles remaining when I fill up. I just wanted to chime in because I have been doing many of the things you are worried about for quite a while and it hasn't caused any problems for me. Unless something changed between my first batch car and yours, I don't think those behaviors are to blame.