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Thread: poor mpg any help appreciated

  1. #1
    Regular Member mrk's Avatar
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    Vehicle : vectra hatchback

    Trim : improving

    Engine : 1.9cdti mas remap

    Year : 06

    Default poor mpg any help appreciated

    cdti 150 averaging 40 mpg over a tank full (i've not got mpg display)mainly 2 runs a day about 12 miles each work and back ,morning average 55mph evening traffic all the way just thought 50 mpg plus would be achievable any ideas?

  2. #2
    Regular Member Grumpy1954's Avatar
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    Vehicle : Ford Kuga

    Trim : Titanium

    Engine : 2.0dtci

    Year : 2014

    Mileage : 1200

    Default

    Not enough miles? takes 5 miles to fully warm the engine up.

  3. #3
    Regular Member john_k_sri's Avatar
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    Vehicle : Vectra

    Trim : SRI NAV XP

    Engine : 1.9 CDTI 150

    Year : 2007

    Mileage : 72K

    Default

    Half of those miles are done each way before the engine is fully warmed up. So on that basis 40mpg is about right.

    Go on a long run mostly motorway and A-roads and you'll see the difference.

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    Default poor mpg

    at 2000 rpm when you are pulling away is there a flat spot then woooosh off you go? if so your swirl bars off mate....

  5. #5
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    I do a similar daily commute, and average 42mpg, so yours sound about right to me. Just averaged 52.3mpg on a long 551 mile journey. As has been said short runs are not the best test of a deisel.

  6. #6
    Regular Member the-wizard's Avatar
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    Vehicle : vectra-c

    Trim : sri

    Engine : cdti

    Year : 2004

    Mileage : 98,000

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    You cant expect big miles from short /stop start journeys with a 1.9, but it wouldnt harm someone with the knowlege of the common faults of these giving it the once over. 'not your local monkey' it needs inside info from a fellow owner. or if your spanner wise look at the 'how 2' section for cleaning the boost sensor, EGR, & REPAIR YOUR SWIRL BAR FOR A £1 (if its fell off). using bp ultimate or shell v power is good too.

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    I couldn't recommend BP Ultimate or Shell v Power. They are so much more expensive that they would have to produce a huge increase in mpg to be worth while. A test by the AA indicated if anything, MPG was reduced when these 'premium' fuels were used.

  8. #8
    Regular Member Grumpy1954's Avatar
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    Vehicle : Ford Kuga

    Trim : Titanium

    Engine : 2.0dtci

    Year : 2014

    Mileage : 1200

    Default

    Quote Originally Posted by WilliamLX View Post
    I couldn't recommend BP Ultimate or Shell v Power. They are so much more expensive that they would have to produce a huge increase in mpg to be worth while. A test by the AA indicated if anything, MPG was reduced when these 'premium' fuels were used.

    I tried the V power, out of interest/curiousity, didn't notice them MPG but car seemed a bit smoother on it. Been back on normal Shell (all the nearby garages are Shell) for a month or so, usually put injector cleaner through as well.

  9. #9
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    I should say this was for premium deisels and premioum petrol used in standard cars. Many higher performance cars need higher octane petrol because that is how they are set up. My Octavia vRS with the 1.8T (180) enigne needed 98 fuel to run properly.

  10. #10
    Full Member Big Sig's Avatar
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    Quote Originally Posted by WilliamLX View Post
    I should say this was for premium deisels and premioum petrol used in standard cars. Many higher performance cars need higher octane petrol because that is how they are set up. My Octavia vRS with the 1.8T (180) enigne needed 98 fuel to run properly.
    I'm sorry, I thought you said higher performance engines
    Now I need a turbo to keep up!

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