Just Commodores Forum Community

It takes just a moment to join our fantastic community

Register

Fuel consumption on sv6

Discussion in 'VE Holden Commodore (2006 - 2013)' started by adam sv6, Aug 12, 2011.

  1. kyone

    kyone Member

    Messages:
    57
    Likes Received:
    0
    Trophy Points:
    6
    Joined:
    Jan 20, 2006
    Location:
    Brisbane
    Members Ride:
    2007 VE CALAIS V
    Most fuel consumption comes from acceleration not your actual top speed. If you do a lot of suburban driving with traffic lights and roundabouts that chews the fuel.

    Cars are designed to be driven at 80km/hr.

    My 07 Calais V does 11.5 over the long term.

    V6 should do between 11 and 12 on average. If you think your fuel sensor is wrong then run down your fuel to half way on the fuel gauge and reset your trip and fill up your tank taking note of how much fuel you have put in. Drive until it gets back to half way and see how many kms you have driven. Fuel from pump: eg 30L distance: eg 300km ... 30/250 x 100 = 12.5 L/ 100km That will be your actual average fuel consumed over 100km.
     
  2. RiCeY

    RiCeY F O R U M W A R R I O R

    Messages:
    4,126
    Likes Received:
    444
    Trophy Points:
    83
    Joined:
    Mar 29, 2005
    Location:
    Australia
    Members Ride:
    VZ SV8 6spd 6.0 470rwhp
    80kph? Who told you that?

    Your calculations and method are correct but a more accurate way is fill the tank to the first click and reset the trip meter. When its nearly empty record the kms travelled and the litres of fuel taken to fill it back up to the first click. (Best to use the same bowser both times if possible).

    L/100kms = (litres to fill up 2nd time) / (kms on trip meter) * 100

    For example 60 litres / 450kms * 100 = 13.33L per 100kms.

    Doing this instead of the half tank test gives a more accurate interpretation of average fuel consumption.
     
  3. VS_Pete

    VS_Pete Donating Member

    Messages:
    4,412
    Likes Received:
    8,737
    Trophy Points:
    113
    Joined:
    Dec 23, 2007
    Location:
    Brisbane
    Members Ride:
    VE II SV6 MY12 SPORTWAGON
    correct that`s how i do it
     
  4. kyone

    kyone Member

    Messages:
    57
    Likes Received:
    0
    Trophy Points:
    6
    Joined:
    Jan 20, 2006
    Location:
    Brisbane
    Members Ride:
    2007 VE CALAIS V
    The longer you travel the more accurate the results you would have.

    About the 80km/hr. I use to work a lot with specialised mechanics. They said a car has to be designed to a an optimal speed. Of course sports cars are not included in this. But as the average speed is 80km/hr that is what they are designed for. If I recall going 80 is the most fuel efficient speed you can do. Just like engines are designed to run at an optimal temperature. It is ideal to get the car to its ideal temperature as soon as possible. Driving a car slowly in cold weather is bad for the engine over the long term.
     
  5. Potta9

    Potta9 New Member

    Messages:
    321
    Likes Received:
    4
    Trophy Points:
    0
    Joined:
    Oct 31, 2011
    Location:
    Camden
    Members Ride:
    Ve r8 , B2600
    maybe its just my ute was a freak but
    It used no more than 11/100 k . I reguarly had it dip into low 6ltr . This photo was driving home from dubbo and going between 85-100 kays and had done just over 300klms on that tank of fuel so far.


    [​IMG]
     
  6. RiCeY

    RiCeY F O R U M W A R R I O R

    Messages:
    4,126
    Likes Received:
    444
    Trophy Points:
    83
    Joined:
    Mar 29, 2005
    Location:
    Australia
    Members Ride:
    VZ SV8 6spd 6.0 470rwhp
    I call BS on that one, maybe on a car with a 1 speed gearbox. They car may have maximum fuel efficiency in top gear at that speed but that doesnt mean it was designed for that speed. Why design a car for one speed, its a bit of a retarded concept when cars travel at various speeds all the time and have various available gear ratios. Engines are designed to run at a certain temperature for maximum thermal efficiency, totally different concept as that temperature can be maintained regardless of speed.
     
  7. eggs

    eggs New Member

    Messages:
    48
    Likes Received:
    0
    Trophy Points:
    0
    Joined:
    Dec 3, 2011
    Location:
    Concord, NSW
    Members Ride:
    VE Series II SV6
    I agree Ricey, I'd say each gear would have an optimum speed but not the car overall.
     
  8. kyone

    kyone Member

    Messages:
    57
    Likes Received:
    0
    Trophy Points:
    6
    Joined:
    Jan 20, 2006
    Location:
    Brisbane
    Members Ride:
    2007 VE CALAIS V
    No sorry you are wrong cars are designed to run at optimal speeds and 80km/hr is about the correct speed for optimal L/100km efficiency. If you lived in a country where the average speed was 200km/hr cars would be designed differently as in a country where the top speed was 40km/hr.

    Some information on the subject:
    Speed kills: testing MPH vs. MPG in top gear - MetroMPG.com
     
  9. aaronevolution

    aaronevolution Donating Member

    Messages:
    1,689
    Likes Received:
    7
    Trophy Points:
    0
    Joined:
    Mar 11, 2011
    Location:
    Hastings, Victoria
    Members Ride:
    TURISMO VZ SS 6.0
    If that was the case, why would manufacturers spend so much on research and development? The average speed in Australia is 60kp/h, so why wouldn't they make that the magical 'optimal' speed you speak of?
     
    Last edited: Feb 6, 2012
  10. RiCeY

    RiCeY F O R U M W A R R I O R

    Messages:
    4,126
    Likes Received:
    444
    Trophy Points:
    83
    Joined:
    Mar 29, 2005
    Location:
    Australia
    Members Ride:
    VZ SV8 6spd 6.0 470rwhp
    Then why does my car get better fuel economy at 100kph on 6th gear than at 80kph in 5th? Im not wrong because youre naive enough to believe everything youre told.
     
  11. aaronevolution

    aaronevolution Donating Member

    Messages:
    1,689
    Likes Received:
    7
    Trophy Points:
    0
    Joined:
    Mar 11, 2011
    Location:
    Hastings, Victoria
    Members Ride:
    TURISMO VZ SS 6.0
    Because he drives a 5 speed auto Calais and has never heard of 6th gear
     
  12. kyone

    kyone Member

    Messages:
    57
    Likes Received:
    0
    Trophy Points:
    6
    Joined:
    Jan 20, 2006
    Location:
    Brisbane
    Members Ride:
    2007 VE CALAIS V
    The average car.. ie 6 cyl not V8 what percentage of cars on the road are 6 speed V8s. Sorry I don't claim to be speaking of all cars.

    When you are told by specialist mechanics you tend to listen.. not by.. not sure what you are.
     
  13. kyone

    kyone Member

    Messages:
    57
    Likes Received:
    0
    Trophy Points:
    6
    Joined:
    Jan 20, 2006
    Location:
    Brisbane
    Members Ride:
    2007 VE CALAIS V
    Exactly.. I do agree with that. Im not talking about 6 speed V8s or 3 cylinder minis..

    Both 4 cyl and 6cyl cars are designed for 80km/hr.

    I did post a link if you wanted further clarification.. or there is Google the source I used to confirm my information.
     
  14. Potta9

    Potta9 New Member

    Messages:
    321
    Likes Received:
    4
    Trophy Points:
    0
    Joined:
    Oct 31, 2011
    Location:
    Camden
    Members Ride:
    Ve r8 , B2600
    Ricey is a mechanic and so am i . I'm definitely with him on this one too. When you say a specialist mechanic what exactly are they specializing in?

    Some cars/4wd's get better economy at different speeds which can be a combination of gear ratios and tire size for example. Also a bit of a tip mechanics do spin s&@t to their customers. If I had a dollar for a customer telling me that another mechanic said this ..... I'd be a very rich man.
     
  15. kyone

    kyone Member

    Messages:
    57
    Likes Received:
    0
    Trophy Points:
    6
    Joined:
    Jan 20, 2006
    Location:
    Brisbane
    Members Ride:
    2007 VE CALAIS V
    They have been trained in the US with CAT and Deutz in Europe. I know a guy that designs engine fuel management systems (But its the CAT guys that told me this)
    Again I agree with you totally.. First and foremost my mechanic spins s#@t all the time.. but we all know that's what they are famous for. Secondly again I'm talking about the average car not someones mates hotted up Rav4.. I don't need to tell you what the average car is.. but the title of this thread would be a great place to start. You mention change gear and tyre size.. that is not "designed" I'm talking about how the car was designed (and i used that word in my post!). All cars spend 99% of their time in the top gear.. an engine can only have one point of most efficency at some rev range at this give top gear ratio.. itsofacto most driving is done around 80km/hr hence ..

    I ask anyone on here.. what do you think the average family car is designed to run most fuel efficient at ? IT'S 80KM/HR !
     
  16. Potta9

    Potta9 New Member

    Messages:
    321
    Likes Received:
    4
    Trophy Points:
    0
    Joined:
    Oct 31, 2011
    Location:
    Camden
    Members Ride:
    Ve r8 , B2600
    FYI I have spent alot of time with cat and deutz. I currently work for Volvo who own a large percentage of deutz and deal with their engines and tech support guys often. Cat and deutz have almost nothing to do with cars nearly everything they do is heavy vehicles or plant . I'm sorry to say but these guys would have no Idea on optimum car speeds for fuel consumption. I find it hard to make a point with someone who has been told by this guy and that guy and are so naive but when told otherwise argue the point.
    When I mentioned wheel and tire size I was referring to how a manufacturer sets up their vehicle ,not by modifying it. They also do come up with tire size and their gear ratios when designing the vehicle it's a major factor of the design !!!

    I've also driven these stock size family cars over the last few years and have always noticed they get better fuel consumption on the highway than at 80
    Holden , Toyota , ford , Mitsubishi , Nissan .
    Now I'll leave you to it.
     
    Last edited: Feb 7, 2012
  17. flyjoe180

    flyjoe180 Member

    Messages:
    93
    Likes Received:
    0
    Trophy Points:
    6
    Joined:
    Mar 29, 2010
    Location:
    New Zealand
    Members Ride:
    VE SV6
    There is a very good Android fuel consumption and running costs app I use called 'Fuel Log'. There is a free version which does pretty much everything you might think, and the paid version keeps graph data for you for longer. Easy to use, great app which I use to help me budget for the car.
     
  18. aaronevolution

    aaronevolution Donating Member

    Messages:
    1,689
    Likes Received:
    7
    Trophy Points:
    0
    Joined:
    Mar 11, 2011
    Location:
    Hastings, Victoria
    Members Ride:
    TURISMO VZ SS 6.0
    As I said in my other post, the average speed in Australia is 60kp/h, not 80kp/h.
     
  19. UFO

    UFO I Believe

    Messages:
    1,860
    Likes Received:
    18
    Trophy Points:
    38
    Joined:
    Oct 29, 2009
    Location:
    Canberra
    Members Ride:
    MY10 VE International Sportwagon SIDI 3L
    I'm a bit late to this one.... I get mid to high 9's average for fuel consumption. 3L SIDI.
    Mix of 70% suburban 30% hwy. Dont put in anything special, just ethanol. Once every 5 fills I'll put in Ultimate (especially if I know I'll be driving on a hwy for a few hours on a trip to Sydney).

    I think tyre pressure is very important. A lot of people under inflate.... the default pump pressure of 32psi is too low for most cars.
     
  20. kyone

    kyone Member

    Messages:
    57
    Likes Received:
    0
    Trophy Points:
    6
    Joined:
    Jan 20, 2006
    Location:
    Brisbane
    Members Ride:
    2007 VE CALAIS V
    I know but i would argue that they know a lot more about car engines then a mechanic does (they don't service them they commission them).. but lets just leave it at that.

    Totally agree But if you could drive the standard car that we talk about on a highway at 80km/hr rather then 100km/hr I would suggest they get better fuel economy at 80km/hr. Highway driving is always more economical because a large portion of fuel is burnt from acceleration not from velocity with suburban driving.
     

Share This Page