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My 2005 had two gray tanks. One for the shower and the other was for the galley. They were each 38 gallons. The second gray tank trips up a lot of new Montana owners as the dump handle for the galley tank is along the frame in front of the wheels.
The tank sensors are junk and rarely work after the first full tank. You will learn how your habits affect the rate of filling the tanks and just dump accordingly.
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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