PERMA-GREEN UPDATE: The 2001 Ride-On incorporates the following changes: 1.) Larger hopper (no longer a Spiker) holds 150+ lbs. ~the calibration problem anthony mentioned? --Gone. 2.) Clutch: uses a new centrifugal clutch, electrically operated and uses no belt slack for clutching. ~the clutch ploblem I had? --Gone. Handful of other changes including a better generator and misc. other improvements. Net Result? Probably woth looking into if you have use of this type of machine and aren't into building one yourself. Jim Gaudioso, The 8 gallon tank will do 64,000 square feet. That's what they claim -- that what it DOES. You use your normal herbicide. It doesn't spray Trimec PLUS (milky stuff) as well as your regular amines. If you use Ester, you will replace the rubber gromets in the spray nozzles more often (Change in 10 seconds w/o tools).