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I always keep one tank on and one off. That way I know exactly when the one tank runs out even if it is between 2 AM - 5 AM.
And I have a nice scar in the forehead from bumping on the corner of the bed room slide at 3:30 AM one morning after going out to switch the tanks over!!!! Ouch!!!!!
Still leave only one tank on and one off, one of these days I smarten up!!!!
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