I just found PSD at Advance Auto Parts. They had 16oz and and 320z bottles. After reading the bottles, the only difference that I really saw between the white and gray, is the cetane, one had more than the other. I tried the mix, and quickly saw the difference,,, engine runs quieter and smoother. I hope the fuel mielage gets better, I'll keep tabs this on tank and let you guys know.

 

that seems to be the only place to find it right now.

 

Drew,

I found PS at O Reilly Auto Parts but then they wanted $15.99 [:'(]for a 96 oz jug. My self I will wait before I pay that much. On the other hand if I get desperate and run out I can get the 96 oz white bottle for $9.15 and tax at my local fleet farm.