What are you guys using & results so far?

 

16oz of power service grey bottle with 8ox mystery marvel oil at each fill up work great, truck sounds smoother and mpg for me has been up 1-2. happy so far. haven't tried any oil additives yet??

 

so, does the cost of that mixture even cover the cost of the fuel saved? I guess long-term it would probably help the engine last longer because of the smoother conditions, right?

 

yes, easily. I use the same mix and get about 1~1.5 better as well. If you get the 3 quart bottle of PSD, and the 1 gallon bottle of MMO, it's alot cheeper per tank. I think I got the PSD for $13 bux for 3 quarts & $13 for the MMO as well... do the math with your mpg #'s and you'll see it'll pay for itself and then some.