I've had a Vault for 3 years now and love it. Consistent every time.
However, that was not the story when I first used it.
Mine had the slide doors- one on each side. Way too much air leak. Fires were out of control- usually too hot. Adding water to the tray brought the temps down so I didn't ruin too many cooks.
Sealed up the one side completely and attached my Guru to the other side.
I can easily get 12 + hours on one full tray of RO lump and a few chunks of wood using the water tray dry.
Double the fuel requirement, maybe even a little more than doulble, if using the water tray with liquid in it.
Mine Vault is stored inside. No outside corrosion at all. Inside is all intact- no water tray leaks or seam separation.
I clean my grates with a large weed burner. I also use a diffusion plate in the fire chamber.
Middle of the winter Minnesota cooks, below zero outside temps and the Vault just chugs along.
I absolutely love this cooker.
Lite beer and Lite music were not made for heterosexual male consumption.
Squirrels are nature's little speed bumps.