Originally Posted by jimchris
15!!!! I thought every one was talking low to mid 20's.
Like everyone, I have watched the mileage numbers. I have 3:55 gears, carry a ladder that typically sucks 1.5 to 2 mpgs on a gas rig. I also have a hereditary disease which ( I am a victim) causes my right foot to be heavy. I am driving thru rolling hills, racing the guy in the right lane that wants to cut me off at the 'right lane ends NOW', and am happy with the mileage of a 4x4 F-350 that can MOVE stock! My 7.3 averaged less, my 6.0 was tuned and a little quicker, my 6.4... (never mind, trying to be gentle here
). All in all... I am okay with it, knowing that the block may take a little longer to break-in, and what I am starting with will only improve. Sometime soon, I will pull my ladder off and see what difference that will make. My 6.4 would be showing 8-9 mpg driving like this, and actually getting 7-8. On flat ground, at 70, 18-20+ mpg would be realistic in this "not the highest geared" truck.