Mpg is killing me

[dommel01]

well after getting a Kem tuned Sct with the 210, 250 and 345 tune, 4in dp back exhaust and S&B intake, ive been getting only 13.5 mpg with the 345 tune, tried the 210 and got 12.5 mpg, i drive veryy conservitaly, why am i getting terrible mpg?

[dafaic]

Describe the truck. Usually from what I am reading the guys with big rims/tires/lifts aren't getting great regardless.

I am also seeing that mileage reports are all over the place. Some people do great and others see almost no gain.

I haven't had the opportunity to calculate mpg yet but what I am seeing is an extra 40 miles per 1/4. Stock I was only getting about 80 miles per 1/4 tank. I am seeing 120 miles per 1/4 tank now.

Based on 30.5 gal tank which is the size of our tanks? This indicates I was getting about 10.5 stock and now around 15.7.

[BlueDemon09]

Originally Posted by dommel01

well after getting a Kem tuned Sct with the 210, 250 and 345 tune, 4in dp back exhaust and S&B intake, ive been getting only 13.5 mpg with the 345 tune, tried the 210 and got 12.5 mpg, i drive veryy conservitaly, why am i getting terrible mpg?

What lock up setting do u have?

[99F250SD7.3]

doesn't the DPF cause poor mileage from the 6.4? I think I read the DPF delete adds like 5-7 mpg! I don't know personally, but read it on a vendors site that sells the DPF delete kit.

[Rob]

Hmmm, 8000 lb truck, tuned, not very aerodynamic = poor mileage. You may gain a little bit with a DPF delete, but not much. I had a 2010 6.4 and the mileage sucked also. I thought I was getting better than I was and when calculated correctly I was way off. These trucks arent made for high MPG's. They are designed for towing. May as well get used to the poor MPG's.

[dommel01]

The lock up on the 345 is 45mph and on the 210 seems to be 50 mph, id love to have a lock up that locks at 40,

I attatched a picture of the truck, the tires are 275's with Xd diesel wheels, i wouldnt think that they shouldnt effect the mpg

Im getting about 100 miles to 1/4 of a tank with the 345 tune

[suban]

winter fuel/ cold weather/ extended idle kills mpg. what type of driving do you do? hwy speeds?

[GamblerHydra]

What gears? I am curious you did not mention , but you are running a dpf delete right? What size lift is that ?

[2010PSD]

Originally Posted by dommel01

well after getting a Kem tuned Sct with the 210, 250 and 345 tune, 4in dp back exhaust and S&B intake, ive been getting only 13.5 mpg with the 345 tune, tried the 210 and got 12.5 mpg, i drive veryy conservitaly, why am i getting terrible mpg?

Welcome to reality. What you are experiencing is just that. Reality. Wild claims of outrageous MPG gains here (and elsewhere) are straight up BS.

[drservo]

13.5 hwy or city? If its city thats pretty good, when I was running stock tires on 20s no matter what tune I used the best city I could get is 12, Hwy was 19.5. After I went to 35's it dropped to 11/16.5. All hand calculated.