I reset it every tank, last week I went out of town and averaged 15.5. This is through 3/4 of a tank around town. I have awesome driving habits.... 2003 Silverado SS AWD stock excpet filter and cat back.

 

thats sucks man, and I thought mine was bad.. i get 12.8-13.5 mpg...

 

wow, I have a fat assed av, and I get 17 mixed.

 

Holy **** man!!

 

double check it when you fill up.
divide your total mileage driven by how man gallons you put back in it.

I drive like 90 and go WOT on almost every take off and still get 15-16mpg avg doing so.

 

dont feel to bad I got about 14.5 on my last trip.

 

I have, I only get 14 out of my RCSB 4.8 too. I had a Lexus IS300 and barely got 17 out of it. I literaly have a 4 mile commmute that takes 15-20 minutes. I just sit there and idle, then plant it on the floor when I have a break. It's something I've come to grips with a long time ago, I just have a lot of people call bullshit and I wanted to post it up.

 

HAHA.. no wonder.

Too bad your commute doesn't involve more driving and less idling.
Get a bicycle!!

Get an SD tune and lean your Idle way out. Maybe that'll help you use less gas while your sitting there waiting for traffic to move.
MIGHT get you to 15mpg !!!

 

I walk when I'm feeling froggy, but I'm usually pretty damn lazy and just take the truck. I've been debating a motorcycle, but I can see myself getting run over pretty easy, it happens a lot here. Atlanta just sucks, but I can't make the money I do here anywhere else, so I'm stuck.

 

How many miles on the truck? Have you changed the plugs and fuel filter?

My Silverado SS AWD with intake and exhaust does 13.5 MPG city and 16.5 MPG to 17 mpg on the highway.

You will never get as good of MPG with AWD as you do with 4X4 running in 2WD but yours seems really low.