Just Commodores Forum Community

It takes just a moment to join our fantastic community

Register

Fuel Consumption.

Discussion in 'VY Holden Commodore (2002 - 2004)' started by stono, Aug 30, 2004.

  1. stono

    stono New Member

    Messages:
    1
    Likes Received:
    0
    Trophy Points:
    0
    Joined:
    Feb 10, 2004
    I recently brought a commodore vy lumina and am getting around 14.5-15.5l/100km. I was wondering what everyones else VY fuel consumption is because the redbook site says fuel consumption is around 10l/100km. I don't drive it excessively hard or fast.

    This is my first commodore and was wondering if this is excessive or normal.
    Cheers
    Stono
     
  2. PIMPIN

    PIMPIN The Lurker

    Messages:
    612
    Likes Received:
    4
    Trophy Points:
    0
    Joined:
    Jan 26, 2004
    Location:
    VIC
    Members Ride:
    VTII Calais 3.8 WHII Statesman LS1
    I think that sounds normalish....10L/100km would be for highway driving I assume..?
     
  3. Astranomical

    Astranomical Ecotec just kicked in yo

    Messages:
    948
    Likes Received:
    8
    Trophy Points:
    18
    Joined:
    Apr 24, 2004
    Location:
    Dee Why, NSW
    Members Ride:
    Hammerhead Eagle i-Thrust
    If i'm correct our VY gets about 10 - 15L/100km
     
  4. peeete

    peeete Guest

    in my VX i work on a system that $10 = 100klms

    it actually works out about right.

    just checked the odo and i got about 210 from $20 @ 94c per litre = about 21L
     
  5. Rippa

    Rippa Guest

    My consumption

    My VY Series I 6cyl Exec gets around 8.2L/100km over the 280k's between Gladstone and Maryborough in Qld averaging around 95kph (few towns to go through pulls it down from the 100-105 I set the cruise on) by the computer which seems pretty accurate based on my calcs. Around town I generally get 12-13. This is running various breeds of premium.
     
  6. peeete

    peeete Guest


    so you think you actually think u get better consumption on premium?
     
  7. Alloytec

    Alloytec New Member

    Messages:
    266
    Likes Received:
    1
    Trophy Points:
    0
    Joined:
    Sep 1, 2004
    Location:
    Mandurah WA
    Members Ride:
    LS1 VT SS
    You will get better fuel economy on premium..

    the more octane a fuel has, the slower it burns. the less it has, the faster it burns.

    a 'fast bang' (low octane fuel) creates less heat because it's not burning for so long, expands quickly after said bang and combined with advanced timing can cause pinging.

    a 'slow bang' (high octane fuel) creates more heat (the flame lasts longer - although a litte cooler), expands slower and combined with conservative / retarded timing causes VERY sluggish performance.

    therefore, to make the most out of a slower burning (high octane) fuel, you will need to advance the timing to get maximum compression and maximum combustion expansion (generally 50% expansion after the spark is when the pressure increases exponentially - that time is measured in milliseconds and nanoseconds) happening at the same time to maximise the amount of force applied to the top of the piston.

    okay. that's the theory out of the way - and the point that a lot of armchair performance enthusiasts will argue.

    fact of the matter is, at high revs, any engine can benfit from a slower, more complete burning fuel to reduce the combustion pressure's tendency to go everywhere but where it should - squish up around the spark plug (part to do with volumetric efficiency). if the intake charge doesn't squish properly and you get a nice fast bang with the engine's vacuum pulling the dizzy around to what might be 5º advance, then you get uneven pressure across the top of the piston. uneven pressure means less torque and less efficiency.

    a slower burning fuel in the same engine with poor squish will spread slower due to the slow bang. this will allow the pressure to spread more evenly across the piston and while not as fast a bang to push things along, the pressure is even and complete and therefore more torque is generated.

    around the city, 98 is useless. you're better using 91 because your engine isn't going to see any kind of prolonged advanced timing or high revs.

    head out on the highway (lookin' for adventure...) and the difference is instantly noticeable.
     
    savage1987 likes this.
  8. Rippa

    Rippa Guest

    My consumption

    Yep according to the trip computer and my calcs I get more k's per litre... on standard it generally goes up to about 8.4 L/100. As explained by alloytec above

    That doesn't necessarily mean it's cheaper as the spreadsheet below shows with fuel @ 90c & 95c (copy it somewhere else to see columns)

    L/tank L/100km km/tank $/L $/tank $/km
    70 8.2 853.65 0.95 66.5 0.0779
    70 8.4 833.33 0.9 63 0.0756

    So on these figures the premium is actually 0.23c per kilometer more than the regular which over a year of 30000ks will cost me $69. This is based on my highway figures, round town would be different, as alloytec pointed out premium makes much less difference. It also ignores any other benefits the premium might give such as cleaner fuel lines, less emmisions etc.

    Of course if I could find the mythical servo where premium was only 2c more or a premium that game me 0.5L/100 advantage it would be a different story.

    70 8.2 853.65 0.92 64.4 0.07544
    70 7.9 886.07 0.95 66.5 0.07505

    I am on the highway most weeks so for 70 bucks a year I use premium... it just feels better.
     
    Last edited by a moderator: Sep 2, 2004
  9. calaiscruise

    calaiscruise Member

    Messages:
    54
    Likes Received:
    1
    Trophy Points:
    8
    Joined:
    Mar 8, 2005
    Location:
    Western Sydney NSW
    Members Ride:
    2004 Calais VYII Gen3 5.7L V8 + Impco Sequent LPG
    VYII Calais 5.7 V8 Economy

    I'd like to share my fuel economy readings for comparison.

    I recently purchased a 2004 VYII Calais 5.7 V8 (obviously an auto) and am well please with my purchase...well done GM Holden.

    Whilst I knew it would be a bit thirsty, it never gets economy like the AS (Australain Standards) specs you see listed in motor magazines, or on Redbook eg. Hwy 8.5L/100km, City 13.5L/100km. ( I would love to find out the exact testing procedure used :confused: ).

    I am a normally conservative driver and travel a mix of light traffic 60 & 80 kph zones, and some 90-110 kph zones, I average 14-15L/100km. This is for light acceleration keeping up with the general traffic flow. Of course pressing heavily on the "loud pedal" sends the fuel usage into the clouds :)

    As the Calais has a multi-display trip computer, I usually have the average economy display on, and notice whilst cruising on a freeway section of 100-100kph, it will sit on about 11-12L/100km...or in a 90kph section it can drop to 9-10L/100km.

    I'm sure this is normal, as it's recently been serviced, but would be interested to know othe peoples figures.

    I have long term plans (having done some internet researching) to install a cold air induction kit, K&N air filter, which I would expect to power, economy and bottom end torque....any suggestions?

    p.s. I am impressed by the communtiy spirit to share and solve questions from members in this forum, well done people :D
     
  10. RKZ234

    RKZ234 Guest

    Fuel Economy

    If you set the cruise at 102km/h, take it easy when overtaking, you can get fuel economy down to well under 7lt/100 km in a V6.

    I've done Coonabarabran (NSW) to Sth East Suburbs of Melb on the one tank of fuel and achieved 6.72lt/100km

    I've achieved these figures twice, once in a VY S auto sedan (achieving an avg 6.72lt/100km and a VX Exec auto sedan achieving an avg 6.75lt/100km, so the minor difference is simply explained by traffic conditions.

    I know I could do better than that if I was willing to cruise a few k's slower than 102.

    6.72lt/100 km is better than 41mpg in the old language!!!

    P.S - calaiscruise, our VX S/C V6 was getting 13.5 lt/100 km economy at best on a trip with 10,000 km on it. We had used Premium from brand new. I installed a pod filter (from D&T Performance Adelaide) and instantly got 8.2/100km on a trip from Melb to Toowoomba. Around town economy has improved by about the same margin of 5lt/100km. Comparing cost vs result, a pod is EXCELLENT value for money and very easy to change. Plus the s/charger spins up quicker supplying more power and delivering it more smoothly. By my calcualtions, having driven a further 60,000km since fitting the pod, it has saved us approx $3000 in fuel costs, meaning it paid for itself after about 7,500 km!
     
    Last edited by a moderator: May 7, 2005
  11. Aggro_VE

    Aggro_VE The Overseer

    Messages:
    557
    Likes Received:
    15
    Trophy Points:
    0
    Joined:
    May 4, 2005
    Location:
    Lake Macquarie
    Members Ride:
    A lazy VE
    Ain't that the truth! :( . Best I managed was 9.4L/100 highway and best city was around 15-16L, worst was 23L/100 :bang: . Hmm maybe the 250kW@wheels might reflect on consumption too. :D
     
  12. calaiscruise

    calaiscruise Member

    Messages:
    54
    Likes Received:
    1
    Trophy Points:
    8
    Joined:
    Mar 8, 2005
    Location:
    Western Sydney NSW
    Members Ride:
    2004 Calais VYII Gen3 5.7L V8 + Impco Sequent LPG
    I guess I will just have live with the limits of a large V8's fuel consumption, though a K&N (or similar) filter and some type of cold air ducting will be on my shopping list. I pulled the radiator "cowling" (?) and air box lid off today to see how some ducting will fit in.....and was schocked to see just how little effort GMH put into getting clean cold air in...none! It sucks hot stale air from behind the headlight and obviously superheated....GMH get's an F for Fail from me.

    How easy it would have been to design natural port to cold air....extra torque, power, economy.....and people wouldn't have to be spending hundreds of $$$ to buy plastic ducting assemblies, that probably cost $5 to make. :bang: Oh well, might have to get my noodle working, to invent my own custom ducting.

    Long term I plan to get my V8 on lpg. I've used it on a previous car (4.2 v8 kingswood) and I swear by it. Though I have investigated and found GenIII dont like being gassed, and was told to wait until Sequentail Vapour injection systems are released for it....probably like that GTI Stealth LPG injection system that was shown on ABC Inventors TV show recently. I cant wait. :D
     
  13. jack.mc

    jack.mc Nothing witty to say :(

    Messages:
    1,085
    Likes Received:
    13
    Trophy Points:
    0
    Joined:
    May 19, 2005
    Location:
    Sydney, NSW
    Members Ride:
    VN Vacationer
    Pod vs Panel

    I, like many others it seems, am torn between a CAI with K&N filter in standard airbox, or pod filter. I do want to keep everything legal, however, and everyone seems to have their own idea on the legality of pod filters in NSW.

    Plus, a CAI kit is like $60 off ebay :) , and that hooks up to the standard airbox...

    I'd love to hear eveyones opinion on this (not that it hasn't been done before!)
     
  14. Secki

    Secki New Member

    Messages:
    419
    Likes Received:
    1
    Trophy Points:
    0
    Joined:
    Nov 22, 2004
    Location:
    Southern Highlands
    Members Ride:
    VH Wagon SLX 253
    i get around 650-690 km to a tank in my VT SS 5.0 litre is this normal? i think its not too bad i do about 60/40 highway/city driving.
     
  15. RKZ234

    RKZ234 Guest

    I'm assuming you fill up just after the fuel warning comes on, meaning you'd be putting about 65-69 lt in to fill, equating to approx 10lt/100 km. That's good.

    No doubt on a trip on the Newell Hwy at 100km/h you'd get close to 750-780km per tank which is very good also from the old 5lt V8.
     
  16. Fekason

    Fekason Fekason

    Messages:
    650
    Likes Received:
    31
    Trophy Points:
    28
    Joined:
    Mar 8, 2005
    Location:
    Penrith NSW
    Members Ride:
    2013 MY12.5 SV6Z + 2016 MY16 SV6, both manuals
    Manual Executive VY S2

    Hi,

    I only have about 3,500 Km so far. Use the car almost totally as a work vehicle.

    Worst was for multiple 3 to 4 Km trips 2 a day for over a month, which gave 14.4L/100Km. That was when the odometer was less than 1,000 Km. Since the 1,500 Km service, the worst has been 13.1L/100Km, again for multiple short trips.

    Best was for trips to Canberra and Woolongong over Christmas/New Year. Travelled 819.2 Km without refuelling, and it took 63 litres. This works out to just under 7.7L/100Km. The odometer went from around 1,400 to 2,300 at the time, so it would still have been running in.

    Consumption seems on a par with my lighter VS S2 Manual.
     
    Last edited: May 24, 2005
  17. clixanup

    clixanup Has Left

    Messages:
    554
    Likes Received:
    8
    Trophy Points:
    0
    Joined:
    Jan 27, 2004
    Don't bother. Nothing so far has proven to be better than these:

    http://www.surefloexhaust.com.au/frame1024x768.htm

    Note: It probably won't make a lick of difference until you get a "tune" done. The Gen3 has all the right hardware for a hi-po engine, but Holden ship them with a very poor tune.
     
  18. CUL8TER

    CUL8TER Guest

    Fuel Consumption Vy

    THIS IS WAY OVER THE TOP I RUN A VY BERLINA 2002 ALTHOUGH WE LIVE COUNTRY WE RUN AT A 60/40 CITYRUN FULL COUNTRY ONLY WITH THE LEAD FOOT DRIVING (WIFE) CONSUMPTION SHOWS A CONSISTANT 9.5L/100KM BERLINA SHOWS FUEL USED AND IS ACCURATE TO WITH IN .25 OF A LITRE EVERY TIME I FILL UP .IE COMPUTER SAYS IVE USED 25.25L
    BUT I PUT IN 25.75L CAN LIVE WITH THAT PSSS
    LIVE IN SA ALL COUNTRY IS AT 110KM HAVE HAD COUNTRY RUNS AS LOW AS 8.8L AND 8.9L/100KM ITS TIME FOR A CHECK UP!!!
     
  19. mars_1980

    mars_1980 New Member

    Messages:
    9
    Likes Received:
    0
    Trophy Points:
    0
    Joined:
    May 29, 2005
    Location:
    Sydney
    Members Ride:
    VF SSV
    Hi,

    I just recently bought an auto VY V6 commodore.
    My fuel consuption sits on about 16-17L/100kms
    I drive mostly to and from work in traffic. I thinks thats pretty high considering red book has average city consumption at 11L/100kms
     
  20. Woogler

    Woogler New Member

    Messages:
    26
    Likes Received:
    0
    Trophy Points:
    0
    Joined:
    Apr 5, 2005
    Members Ride:
    VY S1 Lumina HBD
    Just did my first h/way run since my engine was rebuilt under warranty. Details in another thread. Anyway, form Tamworth to End of F3 north of Sydney last w/e gave me 7.7L/100km.
     

Share This Page