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those stickers are giving the GVWR or Gross Vehicle Weight Rating. That's how much it could weigh TOTAL, with passengers, luggage, etc. NOT its curb weight, which is around 2800 lbs with fluids.
so add the extra 9.9 galons to the existing 1/4 tank, and at 8 lbs a galon, the extra gas would weigh in at 79.2 lbs, making the car ~2819.2 lbs. sounds about right.