2004 GMC Sierra 2500HD Consumer Discussions

Chevy Silverado and GMC Sierra Duramax Fuel Mileage

• Cold Air Intake problem

  Written by: cbears85 on Dec 27, 2010 12:34:46 PM

  Hi all, I'm not sure this is the correct forum. I have a 2004 GMC Sierra 2500HD. I have an Afe cold air intake stage 2 system installed. I am constantly getting a "check engine" light on all the time. No matter what I do the "check engine" is usually on. I have tried cleaning the air filter but to no avail. Every once in awhile the "check engine" light will ... Read More

• Re: Well I purchased the 2006 Dmax 2500HD 4x4 Crew, 3.73 [clongwell]

  Written by: uhlenhakebrian on Oct 15, 2005 9:20:57 PM

  Just curious if your mileage is calculated manually by you when you fill the truck or if you are reading off of the DIC. I have found that the DIC mileage is way off. I have an 2004.5 LLY motor in my GMC Sierra Crew Cab Short box. My lifetime mpg average at 15,000, calculated by me from fuel reciepts is 17.8, this was a mixture of highway and city. I ... Read More