My '00S does exactly the same thing. Sometimes it "corrects" itself but usually it sits at 3/4 after a fill up. Do a search as this is a common problem and there are several solutions ranging from a diy to having a dealer recalibrate your gauge. It hasn't bothered me enough to do something about it. I've never trusted the miles left on the computer. I just wait until the light comes on.
good luck
sean
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