[QUOTE=Mdub707;824470]You're right, that is just you. I get about 15 avg, and never more than 16, and I have a supercab shortbed. The only 6.0 I've seen get 20+ is 2x4 rc/lb. Either you're not calculating correctly or your truck is a freak, that mileage is NOT common in a 6.0.


X2

 

My 1999 7.3 would give me 15.5 in the city, but it didn't have the HP & TQ or the nice looking interior as my 2008

 

The 6.4 need to have the water removed from the diesel every month, oil changed every 5,000 miles, & change both fuel filters no later than 15,000 miles & your 6.4 will last

 

I would NOT go that long on fuel filters. I don't even go that long on my 6.0 and I know the 6.4 is even more picky about fuel. I can tell when they need to be changed by looking at fuel pressure gauge and my pyro. I usually never even make it to 10,000 miles.

 

Rollin 35s with 3.73s at 4000ft (yeah that hurts mileage too), I get about 13~14 in town. I took a trip from northern Nevada to Phx and got 17 on the highway at 68 mph. So yeah, 20~22 in a 6.0 is just you.

My friend's 2000 7.3 gets 12, all the time.