i fueled up my duramax today... 2005 gmc 2500 HD..... i have been getting pretty steady around 13 miles to the gallon, is this normal or should i be getting more then that?

 

my uncle has an 05 duramax and he gets around that. lots of people say they are supposed to get better than that..

my 03 f350 6.0 gets around 14-16 in town(hand calculated)

 

what has been done to the truck if anything, is it lifted? how fast do you drive? are you agressive when you drive? are you hand calculating the mileage?

 

I have an 05 lly gettin just over 19, I know someone is going to give me sh-- about that but come on over fill my tank we'll run it out and I'll prove it!!!

 

no its not lifted at all, and i did it off m.fuelly.com. ya i raced like one time on that tank but other then that it was driven nice.... every fill up its been in the 13

 

I have a 01 and it averaged right at 19to20 with 285's on it drove average speed 65-70 on freeway. Now that I threw a programmer on it it's been getting even better probably now at 22-24 need to refigure. So no that's not really good but all trucks are different. My truck's a freak though even when I go to change my oil it looks clean not like most would look.

 

I get around 19 mpg with mine. Ive got 35s and 6 inches of lift.

 

i got 13-15 with my lbz before I tuned it, now i get 18-21

 

hypertech power programer 3 on my 04.5 LLY, in town i ran 16mpg, highway was 19 to 21mpg