I didn't use diesel purge - I used 16oz Seafoam, 32oz? Diesel Kleen, 8oz veg oil in a 1/2 gallon container with return. Engine was at 80+ c prior to starting. Started up ran for 10 min sounded alot better at idle after a couple min. Drove about 50 mph/3k rpm mostly 3rd gear, few stops, then 75 mph 4th gear. After 1 mi started losing power, WTF? Drove maybe 5 miles total, safely pulled over in construction zone on highway, RAN OUT OF "FUEL" ! Luckily I thought I might be running out so I turned off motor while rolling (I also have 2 gal diesel in trunk since d can be hard to find). Changed lines back, and pumped back up- lots of air, and started raining HARD in front of Orlando airport, lucky again started right back up. Drove back home with a ***** eatin' grin. Couldn't believe it sucked down that much "fuel", what was left in the container was nasty lookin' grey crap, maybe 1oz. I must have cleaned it out really good though! 85 300sd runs super nice, guess 25mpg? prior to purge - broken odometer, At fuel up I add couple oz per gallon of veg oil to ULSD since I bought 6 weeks ago.