my car seems to suffer from this - sometimes the gauge is stuck way over full, and others at about7/8 full. It seems the load in the car stuffs up the fill as well. It makes for some great mpg numbers - good and bad depending on the previous fill. I always just stop at the first shut off - but i'll experiment with your slow fill method next tank or two and see if it helps - i'll be back in a month or 2 - only ever fill up every 3 or so weeks!!!
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