YER NOT THINKIN' WITH YER DIPSTICK, JIMMY!!! :lol:
Sorry, I couldn't resist...
I don't know if there's statistical data about faster ETs or MPH improvements, but I know some synthetic oils like Royal Purple legitimately make a few more ponies on the dyno. The thing is, you have to ask yourself if 3 horsepower is worth $8.00/quart, especially like with our old GT1 car that held over a case of oil that would just get changed at the end of the weekend.
Tommy