Hey everyone thanks for looking at my thread first off ok down to business i have a 2013 chevy 2500hd 4x4 z71 and im only getting top of16.8 MPG empty just me my wife and my daughter traveling cross country i used to have a 2006 chevy 2500 hd and i used to get top of 25 MPG it was crazy what can i do to get better MPG thanks everyone.