It uses 1-1.2 gal an hour. The engine seems to have plenty of power and its really smooth running. I was hesitant about the cyclonic before I got to try one because everyone was sold on the vangaurd. But within the first minute of mowing I would not hesitate again on getting the cyclonic. I have not even started our tractor this year LOL I think I am not going to need it too much any more. I think the 3100 will do 12 mph and the 2000 is 10 mph. Mine has plenty enough power to mow at 10mph I have yet to slow the blade or bogg the engine at full speed.