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Thread: Cruise Control MPG

  1. #1
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    Default Cruise Control MPG

    Just been out for a run in the new motor (v6 CDTi) and tried out the cruise control on the bypass.

    i noticed that the MPG with cruise control driving was hovering 23-25 @ 70mph. Then with CC off and me driving it crept back up to 30-32 @ 70mph... this would've kept going up but turned CC back on and it started dropping again.

    Is this a normal thing (maybe because the car is working harder to maintain that constant speed) ?

    i won't be using cruise control too often if that is the case, especially when using Shell V-Power Diesel at 124.9p

  2. #2
    Regular Member ditchp's Avatar
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    Vehicle : Vectra cdti estate

    Trim : Get a

    Engine : Dirty diesel

    Year : 2006

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    top gear said that CC used more fuel than normal driving when they did that london/scotland/london run a while back.....was it in a merc ???
    Midlands Mod Shop - NFFC.

  3. #3
    Regular Member glynn's Avatar
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    hasn't their been a few mwmbers that have also got better mpg with cruise control on

  4. #4
    Regular Member Caterman's Avatar
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    Vehicle : Signum

    Trim : Elite

    Engine : 3.2 V6

    Year : 05

    Default

    I told you earlier that DPF had just kicked in so it will drink like a fish for around 20 mins so take it easy for a bit

    CC does seem to cause the MPG to drop slightly as it is trying to maintain a constant speed whereas a human can automatically adjust the throttle to compensate

    At 70mph (without the soddin' DPF kicking in) it should be averaging around 40-45 mpg

  5. #5
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    aaahhh yes that old chesnut...

    with all this torque under my right foot i'm not sure DPF will ever turn off

  6. #6
    Ex Vec-C Admin ed taylor's Avatar
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    Vehicle : Vectra Estate

    Trim : Elite

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    Year : 04

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    The novelty of all the power will soon wear off, but enjoy it anyway. You have a nice motor there.

  7. #7
    Regular Member Dan_BlackSRi's Avatar
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    Vehicle : Vectra SRi

    Trim : XP1

    Engine : 1.9 CDTi 150

    Year : 2007

    Mileage : 66000

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    I always use my CC on my CDTi 150, and get an average of 55mpg+ for the week (over 350 motorway miles) - to be honest, never done a week of not using it though.

  8. #8
    Regular Member Daywalker's Avatar
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    Vehicle : Qashqai

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    ditchp i think it was an audi A8 diesel they used from london/edinburgh/london on just a single tank

  9. #9
    Ex Vec-C Admin ed taylor's Avatar
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    Vehicle : Vectra Estate

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    Year : 04

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    Quote Originally Posted by Daywalker View Post
    ditchp i think it was an audi A8 diesel they used from london/edinburgh/london on just a single tank
    It was a 4 Litre thingy. I watched it the other week on the " Dave" channel. Quite impressive for a 4 Litre engine.

  10. #10
    Regular Member Penfold101's Avatar
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    V8 twin turbo I think - he had to average 35mpg, and at the end reckoned he was running on air...

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