I've never run across this topic here, but I'm fairly sure I'm not the only one that has thought about this. I'm wondering if anyone has ever seriously considered coming up with a way to run max BTS at, say 60 or 75 percent WOT? This would be very helpful at saving fuel, reducing noise, and increasing engine life (when on flat ground mowing very thin grass that's not too tall). I know that someone will say that (especially air cooled) engines should be run at WOT no matter what, but I have cases where I don't believe that is the most efficient way to do it.....especially, as I said, with shorter thin grass on flat ground, and, with sharp blades. Any ideas or comments?