And how do you drive? Do you do a lot of coasting to stop signs-stoplights or do you drive like a normal person? The mpg you are getting is outstanding for a truck.
I second the custom tune. I used to have a 4.8 in a 01 silverado Z71. The only thing I had done to it was a magnaflow muffler, K&N intake and the custom tune and I got between 18 to 19.
I live in Jefferson City. Just got rid of my 01 pickup about a month ago for a car. Wife still has the crewcab pickup. Right now I am looking for a older chevy pickup to buy, just so I can have my playtoy