I have been using Marvel Oil, and now adding Power Service to my Fuel tank on fill up. I add 16oz PS along with 16oz Marvel Oil. I took a little trip today and what a surprise. My truck, with 34000 miles on it, has never run this good. I was a dream to drive. Seemed to just float down the highway. The power service claims to get you better MPG. Yes it does!! I won't tell you what my MPG was, because you won't believe me. And you guys with 06's will try to kill me. If it gets any better, I will need to start taking fuel out to keep the fuel tank from running over. [laugh] Have a great day all! javahjoeo from Kokomo

I run 12 PS and 8 MMO every fill up. Seems to make truck run a little smother.

Just used power service for the first time the last fill up and did notice it idles a little smoother.

I have been using Marvel Oil, and now adding Power Service to my Fuel tank on fill up. I add 16oz PS along with 16oz Marvel Oil. I took a little trip today and what a surprise. My truck, with 34000 miles on it, has never run this good. I was a dream to drive. Seemed to just float down the highway. The power service claims to get you better MPG. Yes it does!! I won't tell you what my MPG was, because you won't believe me. And you guys with 06's will try to kill me. If it gets any better, I will need to start taking fuel out to keep the fuel tank from running over. [laugh] Have a great day all! javahjoeo from Kokomo
Man, you could sell snow to Eskimos. [laugh]

Yes it is true the 1st time you use PS you get a drmatic increase in MPG's. After the 1st time your milage with vs. w/o goes down a bit, but It still just barely pays for itself. But where it pays you back in spades is in the gel protection and lubricity addidtives they add.