i'm looking at an 07 sierra 3500 with a 6.6l v8 diesel but can't find any info on fuel consumption, can anyone please help......thank you

 

That will have 3:73 gearing and you will get about 17 or 18mpg at first, but as it breaks in it will improve. I have an 06 3/4 ton and it gets about 20 ever since we hit 50,000 miles. My dad has a truck at work that has almost 300,000 miles on it and he says that it gets almost 26mpg on the highway. You will not be dissapointed with a duramax