Brand new Scag Tiger Cub, 52" 25HP Kohler. I put about 2 gallons in the left tank, right tank is bone dry. Ran great for about an hour, then it stumbled and quit. I thought "there's no way it burned 2 gallons in one hour", but sure enough the fuel level was below the line-of-sight looking in the tank filler. I don't know if it actually ran it dry or not, but I added more fuel to the tank. While I was at it, I added fuel to the right tank, in case the problem was the valve sucking a little air from the empty tank. After more cranking than I was comfortable with, it finally started back up and ran fine. I also noticed that the choke lever runs out of easy travel by about the halfway position... that is, the choke is closed when the lever is full up, and the choke is open when the lever is about halfways down... and the lever won't go all the way down without forcing it. The carb end of the cable doesn't move when I do force it down, it just flexes the cable. I was running the engine in what I considered to be full open choke, at that halfway position on the lever. So I see three possibilities as to what happened... The tank valve started sucking air out of the bone-dry tank (dealer warned me beforehand that this could happen) Maybe I was running with the choke partially closed, drinking more fuel than it should Maybe it's actually thirsty enough to burn 2 gallons in one hour? At that rate, this machine would burn through two full tanks in four hours. I thought it was supposed to run all day fully loaded. I will keep both tanks full or at least partially full from now on, but I'm still wondering about that choke, like maybe it needs to be adjusted. Any thoughts?