Hi guys, im new to the forum and I have some questions. My truck is a Ext cab 01 Z71 5.3 auto. I bought it earlier this year and all summer long averaged 16-17 MPG no matter what. Over the last couple months iv been seeing 13-14 and i'm really not understanding the drop because im driving the same route every day. I was blaming it on warming it up every morning but i drove it the last two days without warm up and checked the mileage at 14.3. Im not looking for Prius fuel mileage but a drop in gas mileage tells me something bigger could be coming. Any information would be much appreciated.