I do not remember how much diesel the purge cycle consumes. It was more than a 606 or 603.

To change the flow rates through the pump and rail it would take some computer programing. If you open up the rail pressure relief valve even the slightest bit, the pressure drops and the engine quits. Changing the flow rate (if it could be done) will only change the amount of time it takes to purge the device, not the amount of fuel needed to do it. And what would you save ? The total purge time is 40 seconds. You could put a lot of effort and money into it and only save 10 seconds.

Diesel is about 1/2 the cost that it was when I got the ML. So I have been running it on diesel since last fall. I have not even converted the E320. If fuel heads for $5 again I will probably do something about it.

__________________
Greg
2012 S350 BlueTEC 4Matic
2007 ML 320 CDI
2007 Leisure Travel Serenity
2006 Sprinter 432k
2005 E320 CDI
1998 SLK230 (teal)
1998 SLK230 (silver)
1996 E300D 99k, 30k on WVO
Previous:
1983 240D, on WVO
1982 300D, on WVO
1983 300CD, on WVO
1986 300SDL 237k, 25k on WVO (Deerslayer)
1991 350SDL 249k, 56k on WVO - Retired to a car spa in Phoenix
1983 380 SEC w/603 diesel, 8k on WVO
1996 E300D 351k, 177k on WVO