Not sure why that is but, I do know fuel senders can be tempermental. Can't tell you how often it happens with me. Shut my truck off with "250 miles to empty" just to start it up the next day to "235 to empty". Senders are funny like that. Like parking your vehicle on a hill, you can get false readings. It's very possible something like that happened. Maybe it really wasn't 1/8 of a tank left. Also, there's the variance of the sender float not reaching to the bottom of the tank completely. No sender float should ever "bottom out" in the tank. Seems to me, you actually had more fuel than the vehicle told you..which is normal. But definately keep an eye on it. If it continues with false readings, take it in. JMHO
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