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If this were true, it would mean the mileage from 1/2 tank to empty to was even better, over 50 mpg. The mpg from full to 1/2 will be the same whether or not you refill at empty or 1/2. Basically the car would be getting 35 MPG from full to 1/2 and then 50 MPG from 1/2 to empty for a 44 MPG average. If that were true, I would refill at empty but only put in 1/2 a tank. I bet there is something else wrong with the calculation or even a leak in the full tank.
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