What kind Of MPG?

[wycowboy]

I.m looking around at motors and was wondering what kind of fuel milage do you all get? I know that driveing habits varry greatly cummins has an artical out that states that there can be as much as a 30% differance between the most and least eficien drivers. but in general what do you all get?? and what do you thnink is the most efient generation of cummmins/? thanks for you r time J

 

[Whit]

I think 20 is possible for any Cummins if driven right, the 12 valvers have the best potential to get great milage, my 01 gets 18-19 in mixed driving and it weighs in at 9660 so its heavy and I dont drive it lightly either, My wifes 04.5 gets 20-20.5 and aint broke in yet............gotta love these trucks

Welcome to the site Wycowboy! which town ya in?

Cheers, Kevin

 

[J.Keith]

Just did a 4500 mile trip @ 70-75 mph and averaged 21.9 mpg.
The worst tank I had was across KS with a head wind driving 75 mph I got 18 mpg

 

[bentwings]

20-22 unloaded easy driving. I watch the wind and allow for it. it really makes a difference over 65. Straight pipe is now showing 1+ mpg across the board so dollar for dollar the best mpg improver. I have 2500 miles on it now and very carefully documented over the same road and very close conditions.

Inj are next. Then probably a mad ecm.

I changed fuel filters... no mpg change. since I run about 13 psi I didn't expect any.

Changed air filter...35% onthe gage....no change either. Maybe a little less smoke on hard runs.

2000 rpm is the sweet spot.

Winter grade ...at least the first level is in and mpg is off already by a solid 1-2. It dropped almost 5 by the time it got really cold last year.

 

[Mike]

My dads 99 24V gets 14 not towing on a good day and 10 or less towing , its slightly modded and I dont know how he drives it but I do know he has a terrible appetite for speed and power, he is in the process of building a balanced, bored, nitrous injected 454 rat to stick in a 55 Chevy two door hardtop , maybe when he gets that thing on the road his mileage will improve on his Dodge ........... but his mileage is poor. He loves the truck/motor though .

 

[99-2500]

My overhead computer says 25.1mpg, how accurate are those things? I have not checked it myself.

 

[Mike]

how accurate are those things?

Not very.............

Only real way to check is to fill to run over, drive known number of miles and refill to run over and divide fuel consumed into miles driven.

 

[dazedandconfused]

My truck gets roughly 17mpg all the time! That is a mix of towing and driving her hard. She is also a 2wd dually with 3.55's and a auto!

Andy

 

[haz-mat19]

My last tank 18.8 the tank before 19.1 this is 65 mph fuel cost are slowin me down . These where both mostly freeway. Mostly I get around 16-17 about 80% around town. I've got 33's so that doesn't help much. See ya

 

[Turbo Tim 1]

I get 15-16 with mine, 3500 4x4, 4.10's and a 5 speed if I'd slow down I'd get 19, I have a few times. The 94-98 12 valves get the best mileage that I've heard.

 

[2500cummins]

Mine gets 17.5 at 75 mph, 65mph will get me 18.5
My wife managed to get 21.5 once, no more than 55mph and never over 10 psi boost for 1/2 tank of fuel
Mine would do 18.5 at 75 mph stock, I lost 1.5 when I got rid of the stock Michelins and another .5 with the 2.5" lift but gained back about 1 mpg with the EZ and 275 injectors, the BHAF made no change.

 

[TPCDrafting]

22 mpg with the foot out of it and stay under or at 65.

 

[wycowboy]

Thanks this is a lot of good info. why is the 12V better on fuel?? less HP.isn't it like at 180hp? any one running diesle kleen or synadane asa fuel additve? J

 

[Mike]

wycowboy.......... where are you from? There is a pretty good slug of us from Wyoming here.

 

[wycowboy]

I grew up in sheridan, Work most of the time over in boulder over by pinedale., where you at.. and by the way the pic of your truck looks like a twinn to mine I jusd have a 97 insted