On about any tractor that has a fuel gauge, you'll have to "get the feel for it". In other words, 1/2 on the gauge might not be half tank. I say this because most of the fuel tanks are shaped irregularly, meaning it might be real narrow at the bottom of the tank and wide/fat at the top of the tank. So when you're running the tractor, it may take 25 hours to get from full to 1/2, then maybe 5 hours from 1/2 to E. They try do do their best (kubota) to make them work like a car does but they can't get it perfect.
And my car is like that too. 290 miles give or take 10 from F to 1/2, then about 100 mi from 1/2 to sitting on the side of the road. I learned real quick to fill up at 1/2. It's because of the shape of the fuel tank and how the sender fits down into the tank.