Overdrive’s Dollars & Sense columnist Kevin Rutherford explains how fuel-saving devices have to make a difference in at least one of four areas to be effective.
The four factors involve basic physics: aerodynamic drag, rolling resistance, mechanical resistance and thermal efficiency. Read more of what Rutherford says about cutting fuel costs.
Big torque used to be reserved for high horsepower ratings above 500 hp with the Cummins ISX15 engine. But now,…