20-22 highway 16-17city driving like an old man
went on a 1600 mile trip with 2 guys and 2 for wheellers on a 16 foot trailer with all are gear and got 14.9 with head wind at freeway speeds on the way back I had 4 wheelers because two people in are group blew theres up and got 16.5 no wind always hand calculate adding 15 mile for every hundred to make up for tire size.
I have straight pipe exhaust cold air intake bully dog power pup with outlook moniter on performance 35's cooper sst on 18's inc leveling kit 20,000 miles

 

18.3 mpg on the heads up. Checkedthe heads upmanuallyseveral times, was off at first, I had the CPU reflashed to fix it, it was within a tenth or 2 after that consistently, so I quit checking it. Interestingly,when new she would run a tad over 14mpg, has beencreeping up ever since, seems to have settled in to 18.3 at 63,000 odo. 69mph 75%, 60mph 15%, around town 10%, if I had to put numbers on it. At 60mph, I'll get over 19mpg. If towing my 6000lb loadedflatbead, knocks off 1 to 2.

Came here looking for any possible mpgimprovements, sounds like I will be trying the PS/MMO mix, this is recomended somewhere here? Maybe a Bully Dog . . .

I'll be needing some new tires next year at this time, will a bigger dia help or hurt? I'm sure wider won't help, but I'm not sure I can resist that.

2004.5 school bus (4 door w 8' box with smooth sided cap the same height as cab)
Stock
ULSF no additives
6 sp man
3.73
4x4

 

Gents,
I real new to the diesel scene and I'm very interested in getting the most out this 6.7. I see various "mixes" that folks use to improve mileage. Is there a link that explains what these are and their benefits? What does Drews mix consist of? MMO, grey bottle???
Thanks, Ed

 

Duh, I found it........thanks for not whippin up on me.......https://dodgeforum.com/m_578939/tm.htm

 

welcome to DF... not sure how the mix applies to the 6.7 & the emissions extra's, but on the 5.9 motors lately most of us have been using 16 oz Power service diesel (white or grey bottle... white for cold weather) and 16 oz of 2 stroke oil (ashless)...

 

before the recall reflash and new module I was struggeling to get 9mpg in town and 12-13 on the hiway. Now with the reflash and stuff I can get 12-13mpg in town. Not sure on hiway yet. Can't go far enought at one time to get a good reading. I do know it has to be better than it was though. 9mpg in town really sucks.

Holiday

 

i have a brand new 3500 megacab 4x4 pure stock with 6200 miles on it. what do u recommend i use for fuel milage. right now maybe 15 to 17 on highway

 

with an engine with low mileage it is still wearing in the rings and bearings. . .your mileage will go up. the main use for the brew is to help replace the lubricative properties diesel is supposed to have since removal of sulfur lowers the lubrocity of diesel. and yea, it does help with mileage as well. . .my mileage realy didnt level out till I was around 20-25K. . .now with nearly 52K I'm pretty much locked in high 17's to low 18's, and that is still dependent on what level I have my TST on and how largeI want mycarbon footprint to be

 

Drew what is the difference between the white bottle of PSD and the Grey bottle? Since i'm in CA and don't really have to worry about the gelling of the fuel is it better to stick with the grey bottle?

 

I found better results with the white bottle for some reason... mpg was slightly better.