Poor MPG Return

Discussion in 'Motoring' started by JFRTDI, Feb 20, 2013.

  1. JFRTDI

    JFRTDI

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    I live approx 3.8 miles away from work which i commute to on a daily basis. I do the odd trips to mums, friends etc all within the same area/radius. From time to time i also travel 225 miles to coventry on a weekend.

    I filled up my Seat Leon FR TDI on Saturday with £10. I have done so far 38 Miles and it tells me i have 20 miles left, although i suspect ill get about 10 if that. So on that basis i think many would agree, that is a poor return.

    I have been toying with the idea of getting rid of it and buying a petrol car as ive covered 17k in 4 years which is probably no where near worthy of a diesel car.

    Question is, if i got a petrol equivalent or similar 170bhp etc. Would the fuel economy be the same or worse?
     
  2. un1eash

    un1eash
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    Depends how you drive but I use to only get 11mpg from my 350z as it was mainly town driving. Our Alfa GT jtdm does 30-32mpg. I would look at something like a fabia vrs as they have the performance but are also meant to return good mpg.
     
  3. marksovereign

    marksovereign
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    If you live 3.8 miles from work, why buy a diesel, it'll never get warm enough to give you decent MPG. Youd be better off with petrol
     
  4. FZR400RRSP

    FZR400RRSP
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    A cold diesel will still give you better mpg than a cold petrol.
    And I'm unconvinced by this 'petrols warm up faster' argument anyway.
    My wife's petrol car takes as long if not longer to warm up than my diesel.

    We thought a petrol would be fine for the wife, seeing as she only does around 6000 miles a year and the car was £2000 cheaper than the diesel version.
    Only 8 months into ownership we're fed up of the constant trips to the petrol station and are looking to get a diesel version.
    Any slight increase in the monthly cost is offset by better mpg and not having to go to the damned pumps every other day!!
     
  5. mjn

    mjn
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    For 3.8 trip to work, i'd be cycling it, rather than waste petrol/diesel.

    Yes, yes, i know that not everyone can cycle to work.

    And the only way to work out your true mpg, is to crunch the numbers.
     
  6. sdb123

    sdb123
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    I thought I'd gone back in time reading about filling up with £10!

    FWIW, I think a diesel is wasted on you given the lack of miles you do....17k over 4 years?! For a true reflection of MPG, fill up to the brim (more than £10 ;)), reset your mileage and crunch the numbers when it's time to fill up again.
     
    Last edited: Feb 21, 2013
  7. lmccauley

    lmccauley
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    Your wife's car must have a tiny tank!

    I do 6000 miles per year in my Boxster (not exactly the most fuel efficient car) and only need to fill up every other week.
     
  8. Longy00000

    Longy00000
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    My wifes Giulietta 1.4 petrol MA with twin clutch auto box, averages about 37MPG with a typical journey being about 18 miles minimum.
    Merc 350CDI diesel averages about 40mpg min journey about 20 miles.

    Given the merc offers nearly 100hp more and is about 400kg heavier diesel can easily give better efficiency.
    Thing is though on long runs (say 100miles plus) the merc can go up to 55mpg where the Alfa only goes upto about 42mpg with the same driver. You pay your money and make your choices!!
     
  9. FZR400RRSP

    FZR400RRSP
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    Even at every other week, it's more often than a diesel would be.
    In my car, I go so seldom to top up that it's become an annoyance to go at all.
     
  10. DVD-Man

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    First world problems huh!
     
  11. loz

    loz
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    Rather nice filling up my X1 and seeing the range indicated as 700 miles, and knowing that will do me for several weeks. :)
     
  12. M1kee

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    £10 of dieselise a tiny amount to make any calculations, and onboard mpg computers are notoriously inaccurate. You need to fill it to the brim and then work out your mpg.:smashin:
     
  13. domtheone

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    Very true.

    My RS Clio is pretty accurate over a full tank on the trip (to about 0.5-1mpg) but when i put a few £10-£15 in, the range/other indicators start to go loopy, especially if there's a motorway run/stuck in traffic town in freezing conditions run in the mix.

    Best to fill to the brim, then repeat when you've used a substantial amount and work out.
     
  14. Rich Marshall

    Rich Marshall
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    Fill it to the 'click' when the low fuel light comes on & record the mileage next time you fill up when the light comes on again.
    Repeat this six times or more to get your average mpg.
    It's the only way to get a reasonably accurate result.
     
  15. Simian Sibling

    Simian Sibling
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  16. JFRTDI

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    Having filled up with £50 a few week ago, i last night ran dry and my figures were

    Price : £145.7
    Distance : 254.3
    Spend : £50

    MPG : 33.69

    I filled up last night to the brim £77, so will see what my next figures are.
     
  17. Simian Sibling

    Simian Sibling
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    IIRC the first full up or 2 aren't counted as it seems your fill up cost you £140+ which surely isn't correct?
     
  18. Frostytouch

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    I think the accepted way is to brim your car, drive it and then brim it again.


    This is the only way to work out exactly how many litres or gallons or fuel used to cover the mileage between the two fill ups.
     
  19. gibbsy

    gibbsy
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    I think we share the same engine, the VAG 170 Tdi, which sits in my Scirocco. My wife likes to take our dog for walk at our local country park, in this cold weather the short journey gets the oil temperature barely above 80C and the trip shows just 36 mpg although it is up hill for most of the way.

    On a run the trip shows usually around the 53 mpg mark recently but in the summer this rises to around the 60 mpg mark, this keeping to the legal limit or just above. The wife has a heavy right foot. So your posted figures look very poor indeed considering our Scirocco has the brilliant DSG gear box. :)hiya: FZR)
     
  20. Matt_C

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    Depends on the car I guess, but on the whole, petrol cars warm up quicker than diesels. My Lexus is up to full (normal) temp within about 5 mins of driving. My Transit takes much longer. To show as a distance, I live 2.4 miles from the M11. My Lexus is up to full temp in half the distance from the M11. My Transit only gets to full temp once I've got ON the M11.

    My neighbours Passat (1.9TDi) was the same. His Merc (1.8 petrol) is like my Lexus.

    Likewise, I can sit and idle outside my house and within a couple mins, even in these cold temps, my temp gauge starts to move on the gauge, whereas my Transit can idle for ten mins and not budge a single point on the gauge.
     
  21. FZR400RRSP

    FZR400RRSP
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    60mpg from a car with co2 of 144g/km?
    Hmmmm....
    I've seen 60mpg from my car at 70mph, but it only emits 109g/km
     
  22. FZR400RRSP

    FZR400RRSP
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  23. gibbsy

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    Not impossible at all. We do a regular journey of 34 miles one way, comprising of a 3 mile single road to a dual/M4/dual with a 50 limit, then 5 miles single to the beach. In the summer the trip computer will show us hitting 60 mpg at some point in the outward journey.

    I'm more than happy from the figures that the Scirocco are returning but perhaps I'm lucky in the fact that I don't have to drive to work, can avoid peak periods and very rarely do any city driving. I would be gutted if I got anywhere near the figures that have been quoted for the Seat.

    Because I've been really ill for the about the last six weeks the car has only been doing really short journeys for the wife to take the dog for a walk and I would think that circa 40 mpg would be an achievement.
     
  24. wyze

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    A lot of your MPG is down to driving style but there are a few things you can do to improve your MPG and get better mileage from you car a few of the tips I got from here.

    Tyre pressures set to fully laden, servicing, topping up the oil if it gets low there are even some mods you can do to your engine to give better MPG like fit a hotter thermostat or get the head flowed and ported and a 3 angle valve job but that is probably too expensive to be worth the saving.

    Try driving at a constant 65 - it makes little difference to journey time but saves loads of fuel.
     

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