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Fuel economy?

Discussion in 'Performance' started by Jenny Frappell, Oct 7, 2016.

  1. MeMatt

    MeMatt Active Member

    Messages:
    120
    Location:
    Woonona
    I’ve been noticing that I seem to get under 13 when city driving and over 13 when doing longer freeway trips… my theory is that doing 90kph at around 3500rpm means there is more fuel pumping around versus doing 60kph and probably 2500rpm.
    Thoughts….
     
  2. oldman

    oldman Super Moderator Staff Member

    Messages:
    10,228
    Location:
    Avalon Beach NSW
    That’d be unusual…..
    Stop start city driving is more likely to be less fuel efficient than highway cruising once you’re up to speed.
    Of course no highway run is without hills etc. but generally you should be getting better figures on a distance run.
    Cheers,
    Mark
     
    Syncro27 likes this.
  3. MeMatt

    MeMatt Active Member

    Messages:
    120
    Location:
    Woonona
    That’s what I thought. It maybe more of a coincidence of when I check fuel economy and it’s been windy. Flying brick economy. Hmmm
     
    oldman likes this.
  4. Wayne murray

    Wayne murray Well-Known Member

    Messages:
    4,409
    Location:
    Seven hills
    Open road cruising is better for fuel economy then city stop, start. :rolleyes: better for the hair as well.:eek:
    After you do some cruising are you filling up straight away or do you drive around a bit after cruising (city driving), as this kills your good economy you would of got from being on the open road
     
    chris taylor likes this.
  5. chris taylor

    chris taylor Well-Known Member

    Messages:
    2,956
    Location:
    adelaide sth aust
    Like what you say Wayne and it does make sense, but from a
    a general point I like to do a bit of both to give me a better idea of how many klms I can safely do between fills .
    Just my thoughts.
     
  6. MeMatt

    MeMatt Active Member

    Messages:
    120
    Location:
    Woonona
    I do agree with highway cruising being better for milage but on paper it doesn’t seem right. My morning trip is 40kms with 30kms of that at 80kph. Arvo trip is 15kms but it’s city driving. It’s a mix of highway for a few days and city for a few more. The highway areas in the morning are quite open and a few spots the bus always moves around due to winds off the mountains…. I fill up approx every 300kms and it costs $45 most times….
    I only started checking economy a month ago.
    At the end of the day, I’m going to keep driving as I do cause I enjoy driving the bus even if it’s costing more in fuel than the other cars we own. (They all average 9L/100).
     
    onetrackwonder and chris taylor like this.
  7. chris taylor

    chris taylor Well-Known Member

    Messages:
    2,956
    Location:
    adelaide sth aust
    I agree,you sort of feel special when your driving it and I guess that's why we have them ,but still a pays to know mechanically, how they going and keeping an eye on yr fuel usage is another way of doing that..
    Cheers.
     
    MeMatt likes this.
  8. onetrackwonder

    onetrackwonder Well-Known Member

    Messages:
    305
    Location:
    Central Tilba, NSW
    No city driving in Central Tilba, wind through your hair, cheers Greg
     
  9. rstucke

    rstucke Well-Known Member

    Messages:
    1,731
    Location:
    Wamberal NSW AUS
    That's not a fuel economy number.
    Would be good to know what you get (around Tilba and long runs)
    We're down that way heaps
    9.5 kl/100 old 40mm Webers, 12.6 with the 44's. I think I need to do some more jetting to get the air/fhel ratios right
    More power, less temperature though (having trouble getting it over 100deg)
     
    onetrackwonder and chris taylor like this.
  10. David H

    David H Well-Known Member

    Messages:
    6,559
    Location:
    newcastle
    Most want 'under' 100deg.
    Less wear at that temp;).
    Cheers
     
  11. Barry

    Barry Well-Known Member

    Messages:
    5,708
    Location:
    Abbotsford NSW
    needs to be above 100 C to get the water out.
    Otherwise you end up with mayonnaise everywhere.
     
    Mordred likes this.
  12. onetrackwonder

    onetrackwonder Well-Known Member

    Messages:
    305
    Location:
    Central Tilba, NSW
    Rick I have never tested my milage, I plan on doing a couple of test runs before we set off for Nambucca, one run up the coast to Gerringong for an overnighter and then we might have a couple of days down in Mallacoota and see what we never got a chance to see at the bus stop due to our break down so I will put pen to paper on our trips and will get back to you, cheers Greg
     
    oldman and rstucke like this.

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