First let me tell you I'm not in the business just enjoy reading the discussions about the machines. Keep up the good work! I come from the old school (read age here) where you use enough throttle to get through the grass you were cutting. Thus more throttle for higher grass and less for lower grass might even go down a gear (pre-hydro here) for the heavy stuff and stay at the same RPM. Thats the way we were taught, saving engines and fuel economy and such. I know they now say open her up......cut wide open, the engine cools better, you get a better cut etc. It just seems that you guys that have high HP machines or larger machines with the diesels would not need to run with the throttle wide open. Lots of those engines are water cooled so cooling shouldn't be an issue at most RPM's. Max torque is very seldom made a high RPM especially in those diesels! Do you guys with those engines peg them to the max and head out for a days work or is there a happy medium somewhere?