Q: The last two times I have filled up with gas my car would not accept a full tank on 2007 Ford Mustang

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10 gallons and then 13 gallons. What could be causing this?
(2) Answers
That and it could also be the weather. whenever the pump stops give it a minute for the gas to settle in. I can fit an extra 1/2 a gallon when i do it with my '07 'stang