08 superduty MPG going up

Discussion in 'Trucks and Trailers' started by supercuts, Apr 22, 2008.

  1. supercuts

    supercuts LawnSite Silver Member
    Posts: 2,785

    just an update, i had posted my new superduty diesel was only getting 11-12mpg off the lot, well 6,000 miles later shes pushing 17-18mpg's highway. thats learning to really stay off the throttle in the 65-70mph range at or just under 2,000 rpms.

    this truck has the average MPG setting on the dash and i spend so much time watching it im affraid when i floor it. ive found that by keeping the turbo psi at or below 10 psi its great on fuel. 20 psi shes getting thirsty and at 30psi up a 1 mile hill on I-84 in ct she was sucking!
     
  2. TXNSLighting

    TXNSLighting LawnSite Fanatic
    from DFW, TX
    Posts: 6,462

    Very good deal!
     
  3. Marek

    Marek LawnSite Bronze Member
    Posts: 1,385

    Are you still running winter blend fuel ?
     
  4. BIGBEN2004

    BIGBEN2004 LawnSite Senior Member
    Posts: 823

    What truck did you get? F-250,350,450,550.....4X4?
     
  5. Gruneich Lawn Care Inc.

    Gruneich Lawn Care Inc. LawnSite Senior Member
    from SD
    Posts: 295

    I have a 08 F350 with the 3.73's, The mileage really started to wake up around 8000 miles, at about 75 or just a tick under 2000 rpm, 17-18, cant wait to see what the mileage does when I install my edge..
     
  6. supercuts

    supercuts LawnSite Silver Member
    Posts: 2,785

    08 f350 srw 6.4l 4x4 ext cab short bed, 3.73 rear
     
  7. supercuts

    supercuts LawnSite Silver Member
    Posts: 2,785

    not sure, perhaps thats why it jumped up, didnt even give it thought.
     
  8. IA_James

    IA_James LawnSite Silver Member
    from Iowa
    Posts: 2,592

    A few thousand miles and #2 vs. #1 would account for alot of that. Figuring out how to drive it would get you the rest.
     
  9. Marek

    Marek LawnSite Bronze Member
    Posts: 1,385

    Do you guys know anyone with a 6.4 in a stake body, if so what kind of mpg are they getting?
     
  10. SimonCX

    SimonCX LawnSite Senior Member
    Posts: 731

    Thats pretty good in my 05 powerstroke if I baby it on the highway the mileage is great but when it's stop and go loaded I average about 12-13 mpg. I waiting for ford to drop to 0% for 60 again so I can get another one.
     

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