I'm new to the Sport Trac, so i'm not sure of my RPM. I have a 2001 Sport Trac 4L, 2WD, original tires/wheels, bought it used. On the highway at 80mph my RPM is 3000. is that correct it seems high to me. My wife has a 2003 Explorer with the same set up and at 80 mph the RPM is only 2100. What...