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Thread: Signum 1.9cdti - what's your MPG?

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  1. #1
    Regular Member Teapot's Avatar
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    Vehicle : Signum

    Trim : Design+

    Engine : 1.9 CDTI 150

    Year : 2007

    Mileage : 101000

    Default Signum 1.9cdti - what's your MPG?

    Just curious really - these days I seem to be averaging about 44mpg (this equates to about 490 miles between full tank and warning light). On long motorway journeys not exceeding 70mph I can get up to 49mpg - taking me to about 560 miles between fills.

    I thought this was reasonable for a 1600kg car, but I've seen many people on this forum claiming to get unbelievable economy - some claiming up to 700 miles per tank on their Vectra or Signum.

    I'm usually fairly sensible - I like to make good progress but rarely using full power, and plan well ahead to minimise braking where possible.

    I always keep the tyres properly inflated, perform routine servicing and fix any faults that I notice straight away. As far as I can tell, the engine runs perfectly and temperature is usually about 80. Manifold and EGR are quite new so unlikely to be the problem. I took some ECU data recordings using the opcom whilst driving and examined the data on my PC - all the results look normal to me.

    So how do some of you guys get such amazing fuel consumption from this engine????

  2. #2
    Regular Member mrk's Avatar
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    Vehicle : vectra hatchback

    Trim : improving

    Engine : 1.9cdti mas remap

    Year : 06

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    thank god its not just me then that only gets 40ish to the gallon

  3. #3
    Regular Member Big Sig's Avatar
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    There have been a few members on here who NEVER got above 38!

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    Regular Member Hideous's Avatar
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    Vehicle : Insignia

    Trim : SRi Nav

    Engine : CDTI160

    Year : 2012

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    490 miles when the light comes is closer to 41mpg, 12 gallons used (there's about a gallon or so of fuel left in mine when the light comes on).
    Is yours an automatic? the 1.9 autos are known to be thirsty - so much so that they aren't any more economical than the 3.0cdti auto.

    I regularly get 600miles to a tank (manual, 150PS) but never >700. Even seen a few claim 750+ on here - they are probably overfilling the tank past the 1st click on the pump giving very optimistic results..

  5. #5
    Regular Member Teapot's Avatar
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    Vehicle : Signum

    Trim : Design+

    Engine : 1.9 CDTI 150

    Year : 2007

    Mileage : 101000

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    Quote Originally Posted by Hideous View Post
    490 miles when the light comes is closer to 41mpg, 12 gallons used (there's about a gallon or so of fuel left in mine when the light comes on).
    Is yours an automatic? the 1.9 autos are known to be thirsty - so much so that they aren't any more economical than the 3.0cdti auto.

    I regularly get 600miles to a tank (manual, 150PS) but never >700. Even seen a few claim 750+ on here - they are probably overfilling the tank past the 1st click on the pump giving very optimistic results..
    Nope, its manual. I notice that you are showing the Vectra here. Is there much weight difference between the Vectra and the Signum - that would explain some of the difference?

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    Regular Member Hideous's Avatar
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    Vehicle : Insignia

    Trim : SRi Nav

    Engine : CDTI160

    Year : 2012

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    Quote Originally Posted by littleteapot View Post
    Nope, its manual. I notice that you are showing the Vectra here. Is there much weight difference between the Vectra and the Signum - that would explain some of the difference?
    ah right, yeah that's the vectra. but if you look at the vectra estate figures, the signum should be about the same weight and mpg.
    not all cars are the same (some get better mpg for unknown reasons), but that's a bit disappointing for the fuel light to come on at 490 miles - if on a motorway trip for sure.

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    Regular Member Aikon58's Avatar
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    Vehicle : shatch- sports hatch

    Trim : cheap plastics

    Engine : metal

    Year : 1901

    Mileage : 999

  8. #8
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    working it out on paper I get around 58-59 mpg the fuel light came on at around 40 miles with 640 miles done but when i filled up it only took 52 litres so still around another 8 left

  9. #9
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    oh mines a 1.9 120 bhp

  10. #10
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    I've just returned from a trip to North Yorkshire, figures show exactly 50 mpg. On the trip up I was getting up to 53 mpg, it was windy. Very windy on the return which does show up those lower figures. I usually average around 54-56 on long motorway trips. Even got 60 mpg once, but who wants to trundle along at around 65mph all the time. I usually stick the cruise on at just above 70mph.
    I would be worried something not quite ok with the car if I was getting less than 50mpg on a long journey. That's doing around 70mph in kinder weather conditions.

    BTW 150 Signum

    Mick

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