I'm still debating on adding chem apps for next year and I have a few more questions for you guys. If I'm using a 200 gallon spray rig, about how many 15,000 sq ft lawns can it treat on one tank? I've been checking around for the chemicals and I can't find how many gallons I could make with a 2.5 gallon jug? This will be a new venture for me and I am just trying to see if it's worth my time and money. Being that we mostly have centipede here it should make it fairly easy as centipede is easy to maintain. Any help or advice you guys have is welcomed.