What kind of Gas Mileage are you getting with your GMC Savana or Chevy express?

I have a 2010 1500 GMC Savana AWD with 5.3L and 3.73 gears and the computer says 15.3 mpg.

Please state What you have. Whether it is a 1500, 2500, 3500 and what engine and gears, 2wd or AWD and what mpg you are getting?