PS gray bottle vs white bottle
Since day 1, I have been running the gray bottle. I made that choice because it contains a cleaner. I figured that running cleaner through it would be a good thing since I didn't know the history of the pump and injectors.
Last time I went to get PS, they were out of gray so I bought the white.
All I can say is...wow, what a difference. I am on my second tank of fuel with the white and it is smoother, quieter, EGT is lower, and it looks like mileage is up slightly (I'll need more tanks to prove that).
So, I'll be sticking with the white bottle for a while.