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9+ MPG Class 8 5 Axel Trucks with Trailers

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Dice1, Sep 15, 2011.

Page 1 of 37
  1. Sep 15, 2011 #1
    Dice1

    Dice1 Road Train Member

    1,315
    609
    Jul 1, 2011
    Bessemer City, NC
    0
    Who is getting this kind of mileage?

    Post your truck/trailers specs and driving habits?

    Modifications and you did it?
     
    Dice1, Sep 15, 2011
    Dice1, Sep 15, 2011
    #1
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  3. Sep 15, 2011 #2
    blanco

    blanco Road Train Member

    1,221
    296
    Nov 20, 2009
    Gwinnett County, GA
    0
    8.5 mpg @ 60mph with 12k lbs - this is computer readout from atl to n.o. louisiana when i reset after I fueled in ga.

    1999 volvo n14 370/430
    11r22.5 michelin xza3 steers 105 psi
    11r22.5 kelly kda drives at 115psi
    lopro 22.5 trailer dunlops fm (i cant remember tire number) 105psi

    fuel is consistent. im at half tanks after run.

    modifications: yes. light left foot. and fifth wheel all the way forward to help aerodynamics as well as trailer tandems all the way forward. less air turbulence? tryin to save for trailer skirts.

    even swift passed me on this run, but i was in no hurry and trying to test a theory.

    maintenance all done by us at our yard. oil and grease etc. fyi, just passed a lvl 1 inspection in florida and got a shiny cvsa sticker for my winshield.
     
    Last edited: Sep 15, 2011
    blanco, Sep 15, 2011
    blanco, Sep 15, 2011
    #2
    Dominick253 and The Challenger Thank this.
  4. Sep 15, 2011 #3
    Frenzy

    Frenzy Medium Load Member

    331
    186
    Mar 24, 2008
    Seattle, WA
    0
    2000 Century Freightliner
    C-15 engine
    Eaton Fuller 10 speed autoshift

    Older Mods
    Centramatic wheel balancers steers and drives
    Changed from duals to Super Singles
    Air tabs
    MotorSilk treatment to engine transmission and rear ends
    BullyDog downloader

    recent mods
    Full tilt exhaust manifold
    non wastegated turbo (Mr. Haney special)
    Walker Noise Breaker muffler

    Current mod in progress
    BullyDog Heavy Duty Watchdog datalogger

    Future mods
    water meth/water injection
    extended fairings

    Future future mods
    Waste heat recovery

    Driving Habits
    Hard core 55, unless faster is free
    Low rpm climbs. 1100 rpm.
    drive like the load is 88k gross

    Current 13 week avg mpg 9.78, Generally run in the very low nines during the winter.
     
    Frenzy, Sep 15, 2011
    Frenzy, Sep 15, 2011
    #3
    Gasienica, Stile, Bob's Buzz and 1 other person Thank this.
  5. Sep 15, 2011 #4
    blanco

    blanco Road Train Member

    1,221
    296
    Nov 20, 2009
    Gwinnett County, GA
    0
    d4mn! i thought my doors were getting blown off at 60, wow. anyhow, 55 is my next experiment on my way back to atlanta. :biggrin_25514:
     
    blanco, Sep 15, 2011
    blanco, Sep 15, 2011
    #4
  7. Sep 15, 2011 #5
    Frenzy

    Frenzy Medium Load Member

    331
    186
    Mar 24, 2008
    Seattle, WA
    0
    It's easier for me. Speed limit in Oregon is 55, and that's where 2/3rds of my driving is done. California is also 55, and Washington is 60.
     
    Frenzy, Sep 15, 2011
    Frenzy, Sep 15, 2011
    #5
  8. Sep 15, 2011 #6
    Gasienica

    Gasienica Heavy Load Member

    924
    528
    Sep 7, 2011
    0
    I never remember driving that slow or those speed limits in those states. Also I never see my mpg's being north of 6.75. My loads are 45k also.

    Interesting mods you guys did. Thanks for sharing that info guys.

    Don't worry about your doors being blow off those mpg's are speaking for themselves. When I get enough self contol over myself I'll try this but for now time is money over here still.
     
    Gasienica, Sep 15, 2011
    Gasienica, Sep 15, 2011
    #6
  9. Sep 17, 2011 #7
    Dice1

    Dice1 Road Train Member

    1,315
    609
    Jul 1, 2011
    Bessemer City, NC
    0
    My truck that I used to get around 5 mpg with before I woke up and changed my driving habits with some mechanical modifications!

    1998 Volvo 770
    3406E Cat
    13 speed Eaton tranny in 12th gear 1325 rpm # 57 mph mostly
    3.36 rear end gears
    Pittsburgh Power Box level 1 mostly
    Pittsburgh Power turbo and exhaust manifold with turbo blanket and exhaust wrap
    Pittsburgh Power Crankshaft dampner and balancer
    FASS
    Walker MegaFlow Mufflers
    Fleet Air Filter
    Air Tabs on tractor
    Deflecktor Wheel Covers on tractor only
    MicroBlue micro-polished and coated wheel bearings on tractor only
    MicroBlue micro-polished and coated rear end parts on both rear ends
    Bridgestone M720 fuel saver drive tires 11R 22.5
    Continental HRS2 16 ply steer tires 11R 22.5
    Mobil One 5W40 Synthetic Motor Oil
    Walmart 2 cycle oil added around 150:1 to fuel

    I averaged 8.59 mpg range on my dedicated runs during July. My dedicated runs are with 48' special made dry vans that I gross around 79K for 1/2 the trip and around 55K on the return on the around 1060 mile roundtrip. I use the same fuel stops and routes most of the time.

    The MicroBlue micro-polishing and coating that has my August Fuel Mileage Average out of the 8 mpg range and into the 9 mpg range.

    My fill ups for 3 dedicated runs was:
    August 3rd : 9.21 mpg
    August 9th : 9.26 mpg
    August 12th : 9.34 mpg

    with one wild run with light trailers:
    August 6th : 10.02 mpg

    Even Bobtailing August 16th: 14.04 mpg (Port Saint Lucie, FL Flying J and bobtailed to the Flying J in Rock Hill, SC to use 40.97 gallons on 575 miles)

    I am considering switching to Michelin Super Singles on the drives in September or October to hopefully gain 3/10ths to 1/2 mpg more.

    Been battling another leaking CAC that I am swapping for a heavy duty one (Vista-Pro) on Tuesday 9/21/11 that MicroBlue wants the rear ends out of my truck and swapped for 2 more with some enhancements to possibly gain even more MPGs.
     
    Dice1, Sep 17, 2011
    Dice1, Sep 17, 2011
    #7
    Lepton1 and Stile Thank this.
  10. Sep 17, 2011 #8
    3rd Gen Driver

    3rd Gen Driver Light Load Member

    134
    25
    Jun 6, 2010
    SC
    0
    DICE...what's with the 2-cycle oil in your fuel? Never heard of this...
     
    3rd Gen Driver, Sep 17, 2011
    3rd Gen Driver, Sep 17, 2011
    #8
  11. Sep 17, 2011 #9
    American-Trucker

    American-Trucker Road Train Member

    10,371
    5,085
    Nov 8, 2009
    Charlotte, North Carolina
    0
    2007 Freightliner Century Class ST

    435hp Detroit
    10 spd
    22.5 Super Singles all 6 tractor wheels at 110psi

    Simple basic bare bones company truck


    Barstow, CA to Flagstaff, AZ to Winslow, AZ to Fort Defiance, AZ to Alburquerque, NM to Denver, CO = 1,249 miles 9.99 MPG with a 15,000lbs load :yes2557:


    If im always hauling 25K or less i will get 7.2-8.75 mpg average with idleing

    if i'm heavy 25K+ loads i can be between 5.5 and 6.7mpg with idleing





    American Trucker
     
    American-Trucker, Sep 17, 2011
    American-Trucker, Sep 17, 2011
    #9
  12. Sep 17, 2011 #10
    Dice1

    Dice1 Road Train Member

    1,315
    609
    Jul 1, 2011
    Bessemer City, NC
    0
    Just adding it as lubricant for the ULSD in older motors like mine. I believe it might even help a little with the MPGs too.

    There was some testing on this and several other additives used and I like the cost of this one and what it did compared to Lucas and others that cost 2 or 3 times more per gallon.
     
    Dice1, Sep 17, 2011
    Dice1, Sep 17, 2011
    #10
    willardskillard Thanks this.
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