[CBE6.7]

I dont know how common it is, but mine gets about the same. It averages around 14 and highway is around 17.

 

[antwan718]

Do some general upkeep to the truck, change out the fuel filter, see if the rear diff fluid has ever been changed, and of course exhaust (kick the cat.)

 

[ynots57]

sounds somewhat low, is it a srw, lifted or oversize tires? i noticed gains at 30,000mi, i agree with above, a restricted air filter could add to low mpg also. i noticed biggest gain after adding aftermarket cai

 

[travz500]

it is a dually has new air filter and fuel filter my 02 with the same trailer and with a bigger loader averaged loaded for about 500 miles up and down in missouri 12 mpg went to wichita with his yesterday with my loader and the trailer he got 8.5 loader pretty unhappy with the mileage but runs excellent performance you cant complain about guess you cant have it all oh well its not my truck:lol3:eelout:hyper: