I am glad to see the results of this test. My engine ran pretty smooth to begin with but I got my hands on 2 bottles of rev-x and figured what the heck. I did an oil change switched to Rotella T6 and dumped in the rev-x. I did not really notice a difference but then again I don't normally check fuel mileage.

This is good to know. I will be using Rev-x at every oil change now!