With tanks empty, get a gallon jug and start filling in dumping. Check the gauge after each gallon and take notes. Will take some time, but you will no longer have any questions as to how much room is left after 1/3,2/3, full etc...
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2020 Ram 1500 5.7L
2007 Chevy Duramax LMM/Allison (Sold)
2012 Jay Flight 29QBH (Sold)
2012 Jay Flight 26BH (Sold)
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