Xantia Fuel economy
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  1. #1
    Real cars have hydraulics DoubleChevron's Avatar
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    Default Xantia Fuel economy

    Out of interest, what sort of fuel economy do you guys get out of you Xantias.

    Last weekend I went to Mildura and back (about 1000kms) mostly highway and averaged 32mpg ... I would have been hoping for high 30's to low 40's. This was with the cruise control set to 110km/h and the air-con on.

    Now driving there and back in the CX 2500 GTi Turbo consistantly returns 34mpg .... However it doesn't have air-con or cruise.... But still I'd expect a Xantia with a fraction of the power and speed to return much better fuel economy than a 20year old turbo charged CX

    the car is an 8valve slugomatic. Are others getting considerably better than this ??

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    seeya,
    Shane L.
    'Cit' homepage:
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    '85 Series II CX2500 GTi Turbo I
    '63 ID19 http://www.aussiefrogs.com/forum/citro%EBn-forum/90325-best-project-car-you-have-ever-seen.html
    '72 DS21 ie 5spd pallas (last looked at ... about 15years ago)
    '78 GS1220 pallas
    '92 Range Rover Classic ... 5spd manual.

    Yay ... No Slugomatics


    Modern Junk:
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  2. #2
    Fellow Frogger! PSvensson's Avatar
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    Quote Originally Posted by DoubleChevron
    Out of interest, what sort of fuel economy do you guys get out of you Xantias.

    Last weekend I went to Mildura and back (about 1000kms) mostly highway and averaged 32mpg ... I would have been hoping for high 30's to low 40's. This was with the cruise control set to 110km/h and the air-con on.

    Now driving there and back in the CX 2500 GTi Turbo consistantly returns 34mpg .... However it doesn't have air-con or cruise.... But still I'd expect a Xantia with a fraction of the power and speed to return much better fuel economy than a 20year old turbo charged CX

    the car is an 8valve slugomatic. Are others getting considerably better than this ??

    seeya,
    Shane L.
    Around the city I find them to be very firsty for a 4 cylinder,
    between 9-13L per 100km
    highway is much better more like 7.5-8L
    take it into account mines a manual too and im a bit of a lead foot

  3. #3
    1000+ Posts Ken W's Avatar
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    Shane,

    We get about 10l per 100km out of our Xantia around town so long as the traffic is not too bad and about 7-8L per 100km on the highway in similar conditions to your trip. However, mine is a 16 valve manual which does have hight compression than an 8 valver.

    Your auto should be operating with the torque converter locked up at that speed so it being an auto should not be a great influence I would have thought. Did it feel like it was locked up?

    What sort of revs does an auto do at 110km/kr? Our manual does about 3200 rpm at that speed in Fifth Gear.

    What sort of consumption do you get around town?

    Was there a big headwind, no roofrack with stuff on top I presume.

    Maybe you need to get the O2 sensor performance / mixture checked.

    Where you using PULP or better petrol?

    Does your ECU light go out as soon as engine fires?

    Ken W

  4. #4
    Moderator Alan S's Avatar
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    I get around 9 - 10L/100 klms around town and about 7.5 on a trip although I did once get 6.8 over a couple of hundred klms using Optimax.
    Worst consumption I ever got was when I tried it on standard ULP although I filled up on 95 octane the other week and was pleasantly surprised by the results.


    Alan S
    If it ain't broke, use a 12" shifter.....that usually does the trick!!

  5. #5
    Fellow Frogger! Clogzz's Avatar
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    Xantia 2.0i 8 valve slugbox:
    9 l/100 km in suburban driving.
    7.5 l/100 km on freeway.

    When using low octane petrol, the car drinks it faster.
    I think that Mobil has a policy of keeping RON 95 within 5Ę of RON 92.

  6. #6
    Fellow Frogger! Ren25's Avatar
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    My onboard computer is in overload mode. Shanes original question was in MPG and yet everyone has answered in metric. Can we please standardise 'cause I can't do the maths.
    Thanks
    Mike
    PS and don't come back with any complicated conversion formulas OK?
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  7. #7
    Fellow Frogger!
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    I'm going to come back with another different measurement type as litres per 100Km is alien to me too

    I only ever do around town driving and I've been struggling to hit 10Km / litre. Typically I get 8 to 10Km / litre which is more thirsty than my 2 litre manual Honda accord (manual) used to be

    So I think they are a bit on the thirsty side.

    Regards,
    Simon

  8. #8
    Moderator Alan S's Avatar
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    Try here to convert:


    http://hemsidor.torget.se/users/b/bo...nv2_e.htm#fuel

    which should tell you that rather than
    So I think they are a bit on the thirsty side.
    should perhaps read
    So I think it is a bit on the thirsty side.
    by using the comparisoon of other cars.



    Alan S
    If it ain't broke, use a 12" shifter.....that usually does the trick!!

  9. #9
    Real cars have hydraulics DoubleChevron's Avatar
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    Thanks Guys,

    do you use the cruise control. This is the first time I've ever bothered use it ... I'm thinking possibly it's whats cost me the economy. Every slight hill/gradient is cracking the throttle wide open... You can feel it constantly surging to add the 2km/h back on it's dropping. Constant accellerator adjustment will also use lots of fuel. Everytime you move the accellerator it richens the mixture.

    I'll start with the air-cleaner I think. Everything works perfectly on the car, slugomatic is fine and appears to lock into top. It run on standard ULP up there and PULP running back. As always I could pick no difference and the economy was identical.

    seeya,
    Shane L.
    'Cit' homepage:
    Citroen Workshop
    Proper cars--
    '85 Series II CX2500 GTi Turbo I
    '63 ID19 http://www.aussiefrogs.com/forum/showthread.php?t=90325
    '72 DS21 ie 5spd pallas (last looked at ... about 15years ago)
    '78 GS1220 pallas
    '92 Range Rover Classic ... 5spd manual.

    Yay ... No Slugomatics


    Modern Junk:
    '07 Poogoe 407 HDi 6spd manual

  10. #10
    1000+ Posts Ken W's Avatar
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    Shane,

    I've found on our 16 valve, that after a tank of ULP, the engine runs like a dog for about the next 3 tankfuls of PULP until the ECU finally recognises the better petrol and advances the ignition back. The best way to sort this is to reset the ECU by disconnect the battery for 10 minutes of so.

    Perhaps you could try this with yours and see if it that works too.

    Ken W

  11. #11
    Real cars have hydraulics DoubleChevron's Avatar
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    Thanks Ken,

    I'll try that ... The problem is the motor runs perfectly ... Sure it's slow (it is a 1.9litre motor pulling dragging a 1500kg lump of metal around through a slugomatic gearbox)... It does run well though, and really seems to hit a power band at 4500-6500rpm.

    The fact you guys can pick the difference between fuels and I can't possibly points to it not advancing the ignition when better fuel in put in the tank ?

    seeya,
    Shane L.
    'Cit' homepage:
    Citroen Workshop
    Proper cars--
    '85 Series II CX2500 GTi Turbo I
    '63 ID19 http://www.aussiefrogs.com/forum/showthread.php?t=90325
    '72 DS21 ie 5spd pallas (last looked at ... about 15years ago)
    '78 GS1220 pallas
    '92 Range Rover Classic ... 5spd manual.

    Yay ... No Slugomatics


    Modern Junk:
    '07 Poogoe 407 HDi 6spd manual

  12. #12
    Member dom19's Avatar
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    Default Mpg

    Shane, when I drove my xantia back from Sydney last weekend I got 38 mpg, slugomatic, aircon on auto, 100-110 klm all the way. One half hour period at 5-10 klm on hume leading up to roadworks.
    Dom
    Xantia SX 1997
    Toyota Spacia 2000

  13. #13
    Moderator Alan S's Avatar
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    Shane,

    The only difference I found in mine when I went to ULP was that it pinged as I hit the gas pedal just a 'craaack' and I could almost see the needle drop on the fuel gauge.


    Alan S
    If it ain't broke, use a 12" shifter.....that usually does the trick!!

  14. #14
    Member dom19's Avatar
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    Default More info...

    Car had just been serviced,new air filter,plugs, synthetic eng.oil(if it makes a difference???) no Cruise control car is 8 valver , filled it with PULP just me & over night bag. I think you are right about cruise controls. my experience is they are constantly kicking down the auto on hills & increasig engine speed when without it youd let the car slow then increase speed on the down hill run.
    Dom
    Xantia SX 1997
    Toyota Spacia 2000

  15. #15
    Fellow Frogger! Trixie's Avatar
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    Our 8 valve manual (Optimax) gets:

    Country cruising 110km.h: 35mpg plus (8l/100km)
    Spirited driving open road: 30-33mpg (8.5-9.5)
    Outer urban running: 24.5mpg (11.5)
    Inner urban with a/c 23.5mpg (12)

    Best ever is 38mpg (7.4), worst 21mpg (13.5)

    mpg x l/100km = 282
    John

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  16. #16
    Real cars have hydraulics DoubleChevron's Avatar
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    Thanks Trixie,

    yours is nearly a sister car to mine, so the economy I'm getting actually sounds about right I'd consider using the cruise control definatly as "spririted driving" particually the way it constantly surging the car forward in an effort to sit on exactly the speed it's set too.

    Strange as it sounds, short of open ride driving without cruise control the old CX appears to return very similar fuel economy figures. I guess it's in the weight and gearing. The old CX is rolling along at 2200rpm @ 100km/h effortlessly, where as the Xantia has the throttle open much wider at 3000rpm. Remembering they probably weight about the same. The Xantia is most certainly NOT a light weight like the BX. With the same driving (same motor) in the BX we used to consistantly return about 44mpg.

    seeya,
    Shane L.
    'Cit' homepage:
    Citroen Workshop
    Proper cars--
    '85 Series II CX2500 GTi Turbo I
    '63 ID19 http://www.aussiefrogs.com/forum/showthread.php?t=90325
    '72 DS21 ie 5spd pallas (last looked at ... about 15years ago)
    '78 GS1220 pallas
    '92 Range Rover Classic ... 5spd manual.

    Yay ... No Slugomatics


    Modern Junk:
    '07 Poogoe 407 HDi 6spd manual

  17. #17
    Fellow Frogger! Trixie's Avatar
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    Quote Originally Posted by DoubleChevron
    Thanks Trixie,

    yours is nearly a sister car to mine, so the economy I'm getting actually sounds about right I'd consider using the cruise control definatly as "spririted driving" particually the way it constantly surging the car forward in an effort to sit on exactly the speed it's set too.

    Strange as it sounds, short of open ride driving without cruise control the old CX appears to return very similar fuel economy figures. I guess it's in the weight and gearing. The old CX is rolling along at 2200rpm @ 100km/h effortlessly, where as the Xantia has the throttle open much wider at 3000rpm. Remembering they probably weight about the same. The Xantia is most certainly NOT a light weight like the BX. With the same driving (same motor) in the BX we used to consistantly return about 44mpg.

    seeya,
    Shane L.
    When you drive them, they feel very economical - the easy low-down torque and the fact you can change up under 3000rpm and still keep up. And you hardly ever see the red side of 4000. The quoted kerb weight is 1238kg (the C4 1.6 is apparently 1200kg ). Then again the gearing is low-ish and I tend to drive briskly.

    I suspect if I bothered to try I could get very good economy but....

    Reminds me of my Dad who was crowing about getting something like 46mpg from his Saab 9-3 Syd-Adelaide. I asked him if he enlisted any special techiniques and he told me his secret was to sit on 80km/h
    John

    2005 Renaultsport Clio 182 Cup - French Racing Blue
    2008 BMW 325i M-sport steptronic sedan - Alpineweiss
    2010 BMW 320d Touring Innovations - Space Grey

  18. #18
    Sans Pond. STALLED's Avatar
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    Wow thats some pretty good figures. I reckon in the VR 3.8L 6cyl Commodore gets about 16+L/100 km (could be alot higher I reckon?) in the inner city!
    I havent had the time to work it out because I dont drive the car for a duration of a whole tank so i cant really calculate it accurately.

    Pretty good figures on the Xantia though especially its a "older" PSA motor. What other cars did the 8v motor feature in?

    Stalled
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    2011 Renault Megane 250 Cup Trophee - Sold

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  19. #19
    Fellow Frogger! Clogzz's Avatar
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    No cruise control, and the car does ping with ULP 92, but the exhaust sounds like there's plenty of ignition timing advance.
    The quality of petrol seems to vary depending on where you are.
    2003 C5 2.0i AL4 205,000 km 76372389

  20. #20
    Fellow Frogger! Ren25's Avatar
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    Quote Originally Posted by Trixie
    When you drive them, they feel very economical - the easy low-down torque and the fact you can change up under 3000rpm and still keep up. And you hardly ever see the red side of 4000. The quoted kerb weight is 1238kg (the C4 1.6 is apparently 1200kg ). Then again the gearing is low-ish and I tend to drive briskly.

    I suspect if I bothered to try I could get very good economy but....

    Reminds me of my Dad who was crowing about getting something like 46mpg from his Saab 9-3 Syd-Adelaide. I asked him if he enlisted any special techiniques and he told me his secret was to sit on 80km/h
    Yeah I remember my first trip across the Nullabour in 1967 with an EH and trailer 30mpg average (I was in the back seat) 100km/h was a rare event. Sorry, I go to sleep really fast at 80km/h, a little less at 110 and don't have a problem at 130.
    Cheers
    Mike
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  21. #21
    Fellow Frogger! whitegoshawk's Avatar
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    My Xanita averages 10.8l/100km in the city. Lead-footed size 9 boots driver in dismal city traffic (sydney) running on 98 octane.

    Don't have good highway figures yet; will report back in a week and a bit once I have been driving it a bit on holiday!

    whitegoshawk (burn those dinosaurs! )
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  22. #22
    Fellow Frogger! whitegoshawk's Avatar
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    Ok, got the numbers from some stylin' down the Hume... Try 7.5l/100k on 95 octane

    Not bad really, at this was also quite heavily laden with gear.
    Probably 2 passengers' worth in terms of weight.

    In imperial measure (It does make more sense that way around) my figures are;

    21.7 MPG city
    31.3 MPG Highway

    That's a 2 litre CT Turbo (petrol) engine with A/C on, BTW.

    whitegoshawk
    "You see, wire telegraph is a kind of a very, very long cat. You pull his tail in New York and his head is meowing in Los Angeles... Radio operates exactly the same way: you send signals here, they receive them there. The only difference is that there is no cat." - Albert Einstein

    Xantia Activa CT - Chock full of upsy-downsy goodness!

  23. #23
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    Hi there

    Looking at the sort of fuel consumption various people are getting, I find most of those figures far too high.
    With my 1.9l Zx of course without A/C i expect about 100 miles per 10 litre of fuel , at a steady 60-65 miles, this means about 6 l per 100 km.
    Of course my ZX is a diesel!!!!!!!!!
    cheers Helmut

  24. #24
    Real cars have hydraulics DoubleChevron's Avatar
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    I've asked this question on the old Anydspares board .... and IMO not many people actually recorded there fuel economy accuratly there. ie: fill tank, reset odometer, drive distance and refil tank totalling the fuel that was put back in to fill the tank and the milage done.

    The ones that recorded the lower consumption figures did the maths/economy correctly. The CT turbo above sounds slighty better (if not the same) as the economy figures they were all getting (I'm not sure how it uses so much dino juice ). In my mind a 20year younger Xantia with a motor that is modern and can't have it's origins traced back to the 1930's should get better fuel economy than my CX turbo

    seeya,
    Shane L.
    'Cit' homepage:
    Citroen Workshop
    Proper cars--
    '85 Series II CX2500 GTi Turbo I
    '63 ID19 http://www.aussiefrogs.com/forum/showthread.php?t=90325
    '72 DS21 ie 5spd pallas (last looked at ... about 15years ago)
    '78 GS1220 pallas
    '92 Range Rover Classic ... 5spd manual.

    Yay ... No Slugomatics


    Modern Junk:
    '07 Poogoe 407 HDi 6spd manual

  25. #25
    Moderator Alan S's Avatar
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    Don't forget that your CX didn't have all the anti-pollution politically correct crapalytic converters, anti smog anti everything valves and restrictions either and even if it did, by now they'll be all off it anyway.
    With the 16V I find it very economical until I decide to give it a bit of stick and then I can almost watch the needle fall, yet by comparison, Brad's series one withoout a lot of this crap, seems to get good mileage regardless of the way it's driven. I think that tells the story.


    Alan S
    If it ain't broke, use a 12" shifter.....that usually does the trick!!

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