I get 12-12.5 constantly, I don't know what my type of drive would be considered, my drive to work typically backroads going 50 for about 10 minutes is the extent of my work commute. I have gotten 15 before on the highway, cruise control set at 60.
I broke my cruise control but my foots developed a sense of the right pressure to maintain at speed.
Guess I'm doing good with 12-13 on 37's. Got almost 15 with mostly hwy miles on a 400 mile round trip last weekend.
Edit:: that was cruising at a leisurely 60 mph also. No hurries no worries & lots of scenic back roads.
I drove my truck home 120 miles on $20 with 37s with a little gas to spare,all back roads at 55 mph.
2000 S-cab 5.4 Triton 4x4 3" body lift 4" suspension lift 37" Nitto Mud Grapplers. Blacked out tails,stainless bull bar,Kenwood head unit,black honey comb and of course a gun rack,can't have a truck without a gun rack. Interior lights swapped to blue LEDs,blue leds under dash w/ toggle switch. Skyjacker Hydros all the way around. Half assed build thread http://www.f150forum.com/f78/jackedu...thread-228753/