Truckers Report Jobs

Find Trucking Jobs

Company Driver Company Driver Dry Van Dry Van Flatbed Flatbed Refrigerated Refrigerated Specialized Specialized Owner Operator Owner Operator
More Trucking Job Searches ⌄ Fewer Trucking Job Searches
⌃

Fuel sippers/economy

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Stumper, Aug 25, 2009.

Page 1 of 2
  1. Aug 25, 2009 #1
    Stumper

    Stumper Bobtail Member

    6
    2
    Aug 25, 2009
    winnipeg,mb
    0
    someone/somewhere must have done this:
    2 trucks, same load, same road, same destination, same conditions all round. say, 900 miles

    truck "a" travels at 65MPH
    truck "b" travels at 55MPH

    which is more effecient? fuel/wear&tear

    i can see truck a using more fuel, but!!!! truck b is on the longer, hence using more fuel? you see?

    which is correct?
     
    Stumper, Aug 25, 2009
    Stumper, Aug 25, 2009
    #1
  2. Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

  3. Aug 25, 2009 #2
    25(2)+2

    25(2)+2 Trucker Forum STAFF Staff Member

    18,693
    43,222
    Sep 18, 2006
    the road less travelled
    0
    The miles per gallon figure not fuel used per hour, is the right one considering fuel cost for a trip. Fuel and wear and tear are increased as speed increases because of increased friction and rolling resistance.
     
    25(2)+2, Aug 25, 2009
    25(2)+2, Aug 25, 2009
    #2
  4. Aug 25, 2009 #3
    Stumper

    Stumper Bobtail Member

    6
    2
    Aug 25, 2009
    winnipeg,mb
    0
    which would use more fuel? i think that's kinda were i'm going, i guess.
    truck a, is on the road less "time" than truck b, so what's your thought.
     
    Stumper, Aug 25, 2009
    Stumper, Aug 25, 2009
    #3
  5. Aug 25, 2009 #4
    25(2)+2

    25(2)+2 Trucker Forum STAFF Staff Member

    18,693
    43,222
    Sep 18, 2006
    the road less travelled
    0
    Truck b; for instance, if I'm low on fuel, and I try to get somewhere before I run out, I most likely will run out. If I'm trying to get somewhere before I put in fuel, easy on the gas gets me farther than hammer down.

    It's not that simple, but, the resistance overcome is less at 55 than at 65, if the motor is run in an efficient manner at that speed, 55 would take less fuel for 900 miles than would 65.

    I had a truck once that could not be run efficiently at that speed, that one would run the trip better at 65, but that truck was a real oddball doing a job it was never intended to do, it didn't do it that well, either. I would never have bought that truck in the first place.
     
    25(2)+2, Aug 25, 2009
    25(2)+2, Aug 25, 2009
    #4
  7. Aug 25, 2009 #5
    Powell-Peralta

    Powell-Peralta Road Train Member

    1,585
    240
    Jul 17, 2007
    0
    Don't have time to get into it, but in "b's" case, each piston's intake downstroke is drawing in slightly less fuel than "a's" because it requires less energy(fuel) to go 55 than 65.

    So, b generally gets better mileage.


    Yes?
     
    Powell-Peralta, Aug 25, 2009
    Powell-Peralta, Aug 25, 2009
    #5
  8. Aug 25, 2009 #6
    25(2)+2

    25(2)+2 Trucker Forum STAFF Staff Member

    18,693
    43,222
    Sep 18, 2006
    the road less travelled
    0
    Yes, unless the engine is operating at too low rpms to run efficiently. That is one trouble with 10 speed direct transmissions. 1225 is too low to cruise a Detroit efficiently and any little hill will bog it down. The truck I'm in now will cruise 55 easily in 11th gear; 12th is a bit too tall.
     
    Last edited: Aug 25, 2009
    25(2)+2, Aug 25, 2009
    25(2)+2, Aug 25, 2009
    #6
  9. Aug 26, 2009 #7
    C16KIWI

    C16KIWI Medium Load Member

    575
    142
    Jun 14, 2008
    New Zealand
    0

    Piston intake down stroke isn't drawing fuel like a old carburetor gasoline engine,its all controlled by your foot.
    You can run at 50 and still burn through the fuel if you are hard on the throttle,best way is not to use cruise control be very light on the throttle using the least amount of turbo boost as you can.....IMO
     
    C16KIWI, Aug 26, 2009
    C16KIWI, Aug 26, 2009
    #7
  10. Aug 26, 2009 #8
    Frenzy

    Frenzy Medium Load Member

    331
    186
    Mar 24, 2008
    Seattle, WA
    0
    Here is a link to a Bridgestone article on the subject.
    http://www.bridgestonetrucktires.co.../ra_special-edit_4/ra_special4_fuel-speed.asp

    One issue that has never been covered well is the effect of increased rpm on engine efficiency. Just as air resistance increases with (the square of) speed, so does frictional losses in the engine. If a driver tries to improve MPG by driving slower, but runs a gear lower to do it, part of the gain from reduced air resistance is wiped out by higher engine losses.
     
    Frenzy, Aug 26, 2009
    Frenzy, Aug 26, 2009
    #8
  11. Aug 29, 2009 #9
    Mr. PlumCrazy

    Mr. PlumCrazy Road Train Member

    1,341
    606
    Jul 30, 2009
    Lexington NC
    0
    Depends on engine. transmission. rear gear. terrain and driver and the list goes on
     
    Mr. PlumCrazy, Aug 29, 2009
    Mr. PlumCrazy, Aug 29, 2009
    #9
  12. Aug 29, 2009 #10
    black_dog106

    black_dog106 Road Train Member

    1,786
    1,664
    Mar 29, 2009
    MA
    0
    Interesting read Frenzy, thank you
     
    black_dog106, Aug 29, 2009
    black_dog106, Aug 29, 2009
    #10
  • Truckers Report Jobs

    Trucking Jobs in 30 seconds

    Every month 400 people find a job with the help of TruckersReport.

    • Page 1 of 2