For my 2019 290BH my vehicle weight information sheet states that my grey water capacity is 78 gallons. I asked the dealer if both tanks were 39 gallons & they couldn't tell me, I thought that was weird. It would be nice to have 60 for the bathroom & 18 for the kitchen, that's probably not the case. Just wondering if anyone knows or if they ran & times the faucet to figure it out.