I have a 2006 F-350 SB SC 4x4, 5.4, 3.73's and auto. I get about 9-10 mpg's and maybe 11-12 on highway. What pisses me off is I had a 2001 Chevy 2500HD with the 8.1L and 4.10's and I got almost identical mileage. My engine is 50% smaller, much less power, and no significant increase in MPG's. Well I vented and feel a little better.
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I have 06 250 SC LWB 4x4 and get the same mileage. Again like someone said it is a heavy truck. I had a 05 F-150 with the 5.4 that got 14-15 but the truck weighed a lot less. When I towed it would get maybe 11-12 (can't really remember). My 250 weighs a lot more then the F-150 so the engine is working like the F-150 did with a trailer. Plus I think the SD is less aerodynamic than the F-150 so more drag. My father has a Chevy 6.0L 2500HD SC SWB 4x2 and gets 14-15 highway. Less weight due to no 4x4 = better economy. My only gripe is I would have went with more power with the V-10 and got similar MPG's had I known the 5.4 would get nearly the same mpg. Oh well I'll make a better informed choice next time
well maybe the 6.0 chev engine might have been the better compromise down from 8l to 5.4.
No, the 6.8L V-10 would have been a better compromise
I think the 5.4L loses a lot in the SD due to the loose torque converter around town. We had a 2000 5.4L 2wd at my last job. Ran good, but it stalled a lot higher then my 01 5.4L in my F150 did. This slippage uses more fuel. As a note, my 01 F150 OFFROAD 4x4 with a 5.4L and 3.55 gears got 18mpg on the road 1 time. Usually less. I think it got around 12 or 13 in town.
The SD is a brick in the wind compared to the 97-03 F150 and has a heavier frame and suspension as well.
I'd normally say if your taking it easy then the size/weight of the truck has more to do with mpg than the engine (thats why often the larger motors are actually same/better mpg). most what I seen the chevy will get a little better mpg and probably alot to do with weight I think. However my dads 2500HD with 6.0 gets as bad or worse mpg as my truck...
But still your milleage is pretty poor if your actually trying to take it easy. That might sound right if you drive it hard, but my V10 in my larger/heavier truck gets better mpg than you are getting. I dont have much city driving on it but combined driving the worse ever I have so far is one tank in the 12's.
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09 F-350 V10 4x4 6spd CC/8' ordered 5/26/09 delivered 7/6/09
99 F-150 4x4 Reg/Short bed
78 Big Bronco 4x4 (a work in progress)
84 Tbird (351W project still in dry dock)
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