After 900 miles I am at 12.8 with no real highway driving. I believe my 12.8 is low due to some warranty issues and other issues which I am sure has lowered the average. In comparison my 2013 chev ext cab 1500 with the 5.3 with the same driving for 20,000 miles only averaged 15.5 to 15.9 with the same driving. Both trucks will get more with extended highway driving. My comparison is based on my needs back and forth to work 10 miles each way and short errands and going to camp.