About 10 to 12 years ago, I helped out on a s/s team. We would go to the dyno and run it all day trying all kinds of dif things. At that time, the royal purple DID make a little more than the other oils that we had to test with. That has been a long time ago and I am sure that alot of other oil mfg have caught up on what was going on and may have even made a little better product. I really don't chase oil tec and really don't know for sure. I tried some in my diesel engine when I was making long runs (750 miles one way) to our hunting ranch. I did not see any mpg increase. I know my little stroker motor makes less valvetrain noise with the r/p.