Many drivers believe that because they operate their own vehicle, they are entitled to run it at speeds of up to 75 or 80 mph when the posted limit allows it. If you do this, it would be like driving with a hole in the petrol tank. Most contemporary trucks are calibrated to operate most efficiently and with the greatest torque at speeds up to 68 mph, and some vehicles even go slower. In rare cases, a 10 mph increase in road speed can result in a 1 mile per gallon reduction in fuel use. So, for the same distance, the vehicle will use more fuel. Is it really worth spending over $1,000 to drive less safely while feeling “faster and superior”?