OK, So got some miles now on the 20w-50...My Psi is really good, for my engine, 42.5 Hot Psi while Towing on Freeway at 3000 rpm's..Hot Idle at 25psi.... using about 1 quart per 1500 miles.... So far results are excellent... Also, my very first full tank of gas, not towing, i got my best MPG...