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Poor Consumption All Of A Sudden - 3.0 Tdi

Discussion in 'Audi S4/A4/A4 Cab (B8 Chassis)' started by Djwoody, Aug 18, 2014.

  1. Djwoody
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    Djwoody Member

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    [Aug 18, 2014]
    Hi.
    I noticed this morning on my way to work I got an average consumption of 35mpg.
    Every other morning I have been getting 47mpg+
    Each time I've been driving at 65-70mph.

    Is there a reason why my consumption has dropped suddenly?

    Chris

    A4 B8 3.0 TDI
    #1
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  3. markm,
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    markm, Member

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    [Aug 18, 2014]
    Could be doing a regen ?

    Mine was all over the place , got 47mpg on a run to work, way home was about 36mpg and with air con on the same homeward trip was 25mpg ?
    #2
  4. Djwoody
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    Djwoody Member

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    [Aug 18, 2014]
    I'll keep an eye on it tonight on my way home.
    I've heard change the fuel filter or coolant temp sensor could help if there's a problem.
    #3
  5. desertstorm
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    desertstorm Well-Known Member

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    [Aug 18, 2014]
    Was the car doing regen cycle ? I found with mine that it had a big effect on consumption figures.
    I used to find the engine fans would be on when I parked up if it had been doing a regen.

    Karl
    #4
  6. Djwoody
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    Djwoody Member

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    [Aug 18, 2014]
    Not sure if it was doing one. It's a shame there isn't a notification on the display to inform you of when one is being performed, that would be useful.
    Didn't notice the fans on.
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  7. Djwoody
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    Djwoody Member

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    [Aug 19, 2014]
    Well after another journey to work this morning, it has jumped up to the 40s so I assume it must have been doing a regen. Still not as good as I was getting.
    Would a full service (fuel filter etc) help do you think?
    #6
  8. benjie
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    benjie Active Member

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    [Aug 19, 2014]
    A full service, in my experience, always helped the mpg a bit. Though I never owned a 3.0 TDI , I also found that the coolant temp sensor on my B6 1.9 affected fuel economy a lot, so much so that I included it in my annual servicing, so you might be on to something there. Especially if it's original to the car as it'll be getting on a bit now.
    #7
  9. Djwoody
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    Djwoody Member

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    [Aug 19, 2014]
    Well the coolant sensor is only around £10 so I may get one fitted with my next service like you said.
    Wouldn't do any harm.
    Anyone know if the 3.0 TDI just has the one sensor? I know some cars have two.
    #8
  10. evans1089
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    evans1089 Member

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    [Aug 20, 2014]
    I thought 33mpg at 50mph was good in my 3.0tdi lol..
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