F450/550 6.0 fuel mileage and durability

Discussion in 'Trucks and Trailers' started by AWJ Services, Jun 24, 2010.

  1. AWJ Services

    AWJ Services LawnSite Platinum Member
    from Ga
    Messages: 4,280

    I am at my wits end finding a good 7.3 truck so I may have to get a 6.0 or 6.4.

    What are your real world fuel mileage pulling a load say 15k or more.
  2. unkownfl

    unkownfl LawnSite Gold Member
    Messages: 3,837

    7-10 in a 550 pulling a mid size kubota mini x with 5000lbs of cable. Had no issues ten times the power of a 7.3 on the highway. It had 4.88's too. Just get an oasis and a 06-07 model 6.0. Manual transmission is all we had.
  3. Gravel Rat

    Gravel Rat LawnSite Fanatic
    Messages: 9,544

    The 7.3 F-450/550 isn't going to get that great of fuel mileage either the 2002 F-550 reg cab 2wd I used to drive topped out at 10mpg loaded or empty. My 2003 F-450 6.0 6spd gets 10-12 mpg my 2006 F-450 gets 11mpg drops a little when the truck is max gross.

    Talking to one of my mechanic friends he has a 2004 F-550 4x4 grossing 17,000lbs 365 days a year he is getting 10 mpg.

    You are not going to see much difference or any bettween 4:30 and 4:88 axle gears. If you are towing a lot stick with the 4:88s the 4:30s are okay if your doing lots of freeway driving.

    With a F-550 with the 19,000lb gvw your only option is the 4:88. A 99 to 2004 F-550 has the Dana 135 rear axle you have very little axle ratio options with a stock truck there is aftermarket gears out there but plan on paying 2500 for a gear set.
  4. AWJ Services

    AWJ Services LawnSite Platinum Member
    from Ga
    Messages: 4,280

    10 will be fine loaded. I just do not want do deal with 7 or 8.
  5. Gravel Rat

    Gravel Rat LawnSite Fanatic
    Messages: 9,544

    I don't think you will see below 10mpg but it all depends on how heavy your right foot is.

    If your really concerned ask Bobcat Ron to check his fuel mileage closely because he pulls a trailer daily and where he lives it is fairly flat with some steep hills.
  6. PTSolutions

    PTSolutions LawnSite Silver Member
    from OH
    Messages: 2,331

    yep, currently averaging 7-8 hand calcd withour 1 ton chevy 5.7L dump. looking into getting a new 550 next season.

    just got an 06 6.0L (pickup though) early spring and its been great. oasis was clean. got 12+ mpg on a 5hr roundtrip hauling an 8.5x24' enclosed loaded to about 7-8K, lots of hills and wind resistance though. and AC was on the whole time.
  7. stuvecorp

    stuvecorp LawnSite Fanatic
    Messages: 5,240

    I have yet to see 10, it's more like 8 or 9 in the three thousand miles so far. I personally don't feel the 6.0 has more power than the 7.3. I love the comforts the newer truck has but thought that 01 350 pulled just as well. Someone explain this to me, the 01 350 with 7.3/auto and 3.73 gears pulls the skid just as well as the 07 550 with 6.0/auto and 4.88 gears? I also never dropped under 10 with the 350 and was usually around 12 mpg where the 550 is 8.5-9.5 no matter what I do?

    I feel your frustration on finding a 7.3 that isn't used up, I think if you can find one it would be almost an urban legend. I was told that the 6.4 without the emissions garbage was a monster but who wants to take the chance between it grenadining or getting in trouble for pulling the emissions stuff?
  8. AWJ Services

    AWJ Services LawnSite Platinum Member
    from Ga
    Messages: 4,280

    I pull with a 7.3 and 3.73 gears as well. It stays at 9 in almost all stop and go traffic/city driving and 10-11 on country roads. Thats at 25K or so weight.
  9. 360ci

    360ci LawnSite Senior Member
    Messages: 995

    100% city mileage you'd be hard pressed to get 10mpg or above. It'd be best to get a standard trans truck for mileage. Besides, a heavy truck & good mileage don't mix!
  10. Gravel Rat

    Gravel Rat LawnSite Fanatic
    Messages: 9,544

    You don't want the 6spd manual behind the 6.0 the emmission controls don't allow any throttle response. You need a tuner to get fuel before boost so you have any take off power. It was the biggest problem with my 2003 and it was one of the reasons why I had so much troubles with the 2003 with powering out and traction.

    The 2006 F-450 I have now has a open diff but I have the torqshift transmission the truck starts off on any grade even with 5 ton on the truck. I have little traction issues now I don't know why I guess is it because you can feather the throttle to prevent wheel spin.

    There is only half mile per gallon difference between the 6spd and the torque shift both my trucks weigh the same or they did. The 06 has 4:88 gears the 03 has 4:30 gears.

    I do like driving the 6spd you have more control I find I'am on the brakes more with the 06 the Tow haul mode is pretty much useless for any kind of assisted engine braking.

    If I knew about the the special tuning you could get for the 6.0 trucks with the 6 spds I would have tried it before I bought another truck. Supposidy it works good just pushes out a little more black smoke.

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