My point was that I am cutting easy stuff! There is nothing really hard that drags the machine down. 99 percent of what I am cutting is dead or down. I do not recommend running the machine at less than full rpm. By doing this your pumps are spinning slower and not giving your hydraulic components they need. Since my machine is cooled by a hydraulic fan motor I will always run full rpm. The engine will only make the amount of horsepower that it needs. If you look at your pressure gauge the pressure is very low while the head is spinning free, once you put a load on it it goes up. SMe with the engine, just running with no load does not use that much more fuel than slowing the engine down. Our engines are made to run at a certain speed, there where a lot of guys a whole lot smarter than me that designed those babies.