MPG's?

[spardigus]

Alright, so here lately my mpg have begun to suffer dropping from around 16.9 in the city to the mid 15's. I am not understanding why. I cleaned my filter, changed fuel filters and used some BBK diesel injector cleaner. I cannot figure out what it is. I was told that I might be able to update my firmware on my Xcal 3 but havent had any luck with SCT. Anybody got any ideas as to what could be causin this. Oh and I havent put on new tires or changed tire size and I keep my tires properly inflated. i am stuck??????

[cartmanea]

I'm lucky to get 12mpg in the city, and barely 16.5 on the highway running 65.

[spardigus]

I used to get about 19 on the highway but it is just suffering lately. Also, one more thing how can I fix turbo lag. A buddy of mine has a 6.0 with a bully dog on it and turbo lag is almost non existent. His is 2 years newer than mine but I have driven other 6.0s around that year that have more lag, but not as much as mine.

[cartmanea]

Turbo lag is all in the tuning. Get a good custom tune and you can have almost zero lag.

[dieselnut18]

i get 18-19 runnin 75-80 on the highway and anywhere from 15.5 to 16 in the city depends on how i drive.........have you possibly got new boots? maybe they weigh more lol

[jamstoyz]

maybe its the diesel injector cleaner have you changed your oil lately?

[Blue05]

i wish i was gettin those kinda numbers. 14.3 on the lieometer, runnin 70mph with the cruise on.

[Lubbockguy1979]

14.3 on the lie o meter I get 13.5-14.5 generally last tank was a little hiway with a lot of city got me 15.47. Have you had a dealer visit? Firm ware should not affect milage. The tune might though. Have you been carring more weight possibly?

[Weathermanmc]

I only get thirteen on the highway running about 75, but I am spinning 35" tires on a 20x12 wheel . I wish I could get your so called bad mileage, Ha Ha !

[Lubbockguy1979]

Is that corrected milage? I would think with 35" tires you would be running a little lower rpm anf get great mpgs. unless you have a lot of lift and really heavy wheel and tire combo. I'm planning on either 33 or 35" tires on stock rims when I get to the steels on my truck. My mpgs are best at 60-65 so I plan on running that rpm but using the tires to get 70-70mph