10.0 MPG, this is at about 80-90% stop and go heavy traffic in town driving, and the truck only has just over 1000 miles so she is still pretty tight! I expect that will get a little better, once she loosens up and i get a K&N in. Another factor is I live in PA, lots of hills! There is allot of construction I have to go threw on my way to work, some mornings I don't get over 20mph for 5-6 miles. These trucks were built to be on the open road working!! So I would have to say not to bad, the 5.4 in my F150 only did about 13-13.5 under the same conditions, and it is completely broke in and has a K&N, and EDGE Evo. I can live with it! Drove the F150 5.4 about 50 miles tonight, man I love that V10 6.8, but the 150 definitely rides much better, but then again its not a SUPER DUTY!