I only need to know how long til I need to dump. We can go about a week,on,the black tank & with 2 grey tanks, 1 kitchen, 1 bath/washing machine, the kitchen will last 5-7 days, the bath 1-2 days depending on showers &/or laundry.
It's a waste of time to even look at the level sensors, unless you've upgraded to the high dollar ones, we've had 8-10 rvs none of which the level sensors worked past the first fill.
Sorry I can't answer you're question, but as others have said it really doesn't matter unless you are metering into them or you will only be boondocking constantly.
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Fulltimed 10+ years
Sold '13 Thor Redwood 36 FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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