I just finished my 50 hour service on my kubota 3940 and have put 20 gallons of fuel in...2.5 hours per gallon. I think that is pretty awesome. Obviously there will be a difference in what your doing with the tractor. 200 post holes, 20 hours loader work and the rest box blade to tear up sod and level a feild. I'm sure there are threads that detail fuel usage, but i was impressed 
