First,
If you are going by the tank sensors full is not always full. The tank sensor is never mounted at the tippy top of the tank. It is normally installed 2 or three inches below the top which could be as much as 10 additional gallons beyond full.
Next,
Get one of these meters and then empty the tank zero the meter and then fill the tank until it takes no more and the gauge will tell you how much capacity the tank has.
https://www.amazon.com/P3-Measure-Ga...NsaWNrPXRydWU=
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