When the sonata hybrid computer calculates mpg! I went 518.6 miles and filled up with 15.769. Either the pump was off or something is seriously wrong. It's usually 3mp off, but NOT 7 mpg!
I agree with 41Dave topping off destroys the fuel recovery system.
The 3rd page of the owners manual says " !WARNING Do not " top off" after the nozzle automatically shuts off when refueling"
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