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Best guess would be you filled before at the same pump then changed pumps and got the greater than expected fill.
If so then refill at the prior pump at the same point on the gas guage. If it stops at the amount you had expected, as it had done before, then pull over to the premium pump and see if you can get 2+ more gallons.
Your rear end was lower than the front one the earlier fills, not so at the premium pump.
Try it and see what happens.
regards
mech
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