I also calibrate spray rate per 1000 square feet for easier calculation, but if your 25 gallon tank is only covering approx. 10,000 square feet, you'll have to refill 4 times per acre. That's not very productive.
Edit: I saw your response and it now makes sense. You definitely would be better off with a multi nozzle setup or switch over to an air inducted 110 degree single nozzle and spray without sweeping. Holding that nozzle 16 to 20 inches above the ground, at a normal walking pace, you should be able to cover 1000 square feet in approximately 2 minutes. You'll still have to calibrate by timing your 1000 square foot area, then capture the spray for that same time period. Good luck!
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Last edited by Nate'sLawnCare; 03-04-2013 at 08:22 PM.