I'm getting a Zimmerman 55 gal 3-pt sprayer soon. I want to spray about 15 gallons per acre for glyphosate. Have to calibrate according to ground speed vs PTO speed (pressure). It throws a 25 foot spray pattern. I figured 15 gallons should last me about 1/3 of a mile to provide coverage of one acre. Since the ground I'll be spraying is kinda uneven, I guess I'll have to see what speed I can comfortably travel carrying the 600 pound load using GPS. If I travel at that speed while spraying water, I'll have to adjust PTO speed so that 15 gal lasts for 1/3 mile. Any easier way to do this??