When I was young, driving a ’55 Chevy, I thought of motors as moving objects. How fast could they change speeds; can they rev high and get there fast? Now, driving the motorhome, I think of the motor more as a static object. Set it at 1,600 rpm rolling down the highway. The load varies with the terrain, but the engine holds steady. Now it’s more about how constant a speed the engine can hold than about how fast it can change speeds.