Welcome to the forum! On my 2010 the capacity was split 50/50. It sounds like the tank may be split. Neither of our Montys have had an overflow on a tank.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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