330 miles per tank driving conservative mostly

my mods are in my sig. what the heck is going on?
iam going to back the pump out and take fuel pin out and toss it.

i wanted a bigger turbo and new intake but i cant afford them if iam going to burn fuel like this..

DONT LIE!!!! what are your guys actuall milage with mods...dont say 26mpg

 

the best i have done with my mods is 23.7 mpg on the highway babying the go pedal ....normal driving i get right around 20 around town

 

Hello Lucas.

Diesel Engines are very efficient. Unless you're blowing black smoke, you're probably turning all the fuel into power.

You don't mention how lifted your truck is, if you've got a 100 gallon xfer tank/toolbox (weight of truck) or 40" super swampers.

I have seen all sorts of mileage differences with my trucks. from a stock tire 2x4 d250 with 3.07 and getrag (best was 25 mpg) to my 1972 power wagon crew cab on 37" military tires... I have seen a lot of fluctuation with virtually the same 'mods' to the motor.

That said, if you had your truck setup with a different motor all in all you'd still be getting better mileage with the cummins.

You mention you are looking for 22.5" big rig wheels/tires. Your best bet for mileage is to have pizza cutters like 255/85R16 or stock size tires and stock ride height.

 

Your torque converter could be smoked and causing the engine to scream at high rpm's on the highway.

Is overdrive working>

 

330 miles on how many gallons?

 

are the miles corrected with larger tires. or are they gps recorded miles.

 

Running #1 and cold weather adds up to 14mpg on a good day.....

 

20.5 mpg no matter where my right foot is! is it true that ddp 40hp injectors give u 2 more mpg? i still havent even bumped my timing yet

 

You fail to mention where you're located, winter blend fuel makes a diff.

 

Blowing alot of smoke? When the last time you checked your air filter?

 

Miles per tank is no way to tell if your getting crappy mileage, Unless you are dividing it into the gallons put back in. I only get about 300 to 400 tops, but my fuel guage is whacked. with my settings I get about 17, 18-19 summer on the hwy.

 

20 mpg unless hauling or should i say towing.Im told im always hauling and its loud.I like it and the preacher likes it.So im good never listen to the wife anyway. Preacher is a ford guy exc/250 both 7.3s

 

i get about 17 and i run my truck hard i dont know why you cant tell any more power probably a boost leak because just turning up the pump add's atleast 10psi on your turbo you should be able to tell easily

 

I range anywhere between 14 and 18

 

16 city, 20 country, 18 @70 - 75 on the highway.

Constant light haze when accelerating and at speed on the highway. I dunno how it does so well.