Shift Up, Throttle Back, What is it?
Many farmers run their large 4WD tractors while performing tillage work. Generally they find a gear that lets them achieve a desired ground speed and run at WOT. This practice will get the job done, no question. However, operators may see the Gallons Per Hour go up while this work is performed. This is a result of the tractor running more RPM than neccessary for the drawbar requirement. The amount of power needed for most drabar activities is probably not the peak power output of the tractor. This excessive RPM operation is the root cause of wasted fuel. Good news though: Iowa State University, University Extension studied the "Shift Up, Throttle Back" strategy and have given suggestions on how to save fuel. In fact, during testing some tractors measured up to a 20% reduction in fuel useage.