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Thread: Fuel economy from a 1.8

  1. #1
    Regular Member Ste's Avatar
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    Vehicle : Jaguar XF 3.0D V6

    Trim : Black

    Engine : 3.0D V6

    Year : 0000

    Default Fuel economy from a 1.8

    Just to set the scene.


    I do about 700 miles a week from my home near Mansfield to work near Coventry in my 04 1.8 petrol....

    4 miles town and bypass driving
    54 miles motorway (M1 and M69)
    11 miles dual carriageway and townish.

    And the reverse for the way home

    I usually get about 39 - 40 mpg using Supermarket fuel (Asda mainly, but sometime Morrisons), calculated at each fill - no trip computer on my car.

    For the last tank full I have driven very economically, not revving over 2000 rpm before changing up, not going full throttle and cruising at 70mph on the speedo (which is 67mph on the TomTom).

    I filled up yesterday night and calculated the fuel consumption to be 44.5 mpg, a massive 11% increase over my usual mpg. This is definitely statistically significant, I would say that less than 2.5% difference would be normal variation for my drive cycle. (485 miles and filled with 49.5 litres of normal unleaded).

    My next fill will be Super Unleaded Petrol, just to see if their claim of better fuel economy is valid.


    As I am going to India on Wednesday, I won't be doing this trial until my return, but I will post the results up when I do it. I intend to do the 'economy' drive first, and then maybe do a normal driving aswell.

    I may even split out the economy drive on normal fuel too, to test the difference between my normal cruise speed, and the effects of not going WOT and over 2000 rpm, except in fifth gear of course.

  2. #2
    Regular Member glenboy's Avatar
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    Thats very good Ste,i get about 360miles to a tank around town,whats the mpg if i paid 88.9p a litre??? Ribbish at working these things out.......

  3. #3
    Regular Member m8internet's Avatar
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    I wouldn't bother with Super Unleaded
    There may be a marginal improvement in mpg, but not enough to justify the additional cost
    I would only recommend it for a V6 type

  4. #4
    Regular Member Ste's Avatar
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    Vehicle : Jaguar XF 3.0D V6

    Trim : Black

    Engine : 3.0D V6

    Year : 0000

    Default

    I am going to do it, so when I bang on about them not doing what they say they do, then I will have data evidence based on my own experiences....... and not just opinion...

  5. #5
    Full Member Big Sig's Avatar
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    Best way to do it Ste
    Now I need a turbo to keep up!

  6. #6
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    38mpg is about what I get out of mine, more or less. Worst was 35.3mpg, best 40.4mpg. Tesco normal petrol, and I don't drive particularly economically (I regularly check my cams are phasing and my limiter is working, and I tend to sit around 80 on the motorway). 25 mile commute, 5 miles town, 18 miles motorway, followed by 2 miles town again.

    Noticed no significant increase or decrease using BP Ultimate, or adding STP Octane Booster.

  7. #7
    Regular Member barkzz's Avatar
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    Ive had around 450 miles max outta mine, but when i came to fill it up, it gobbled 58 litres lol! A little too close for comfort

  8. #8
    Regular Member John C S's Avatar
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    Hurrah for Ste.

    Can't wait to see the results fella!

  9. #9
    Regular Member Graham's Avatar
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    Vehicle : Focus

    Trim : Titanium

    Engine : 1.6 TDCI

    Year : 62

    Mileage : 9K

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    Quote Originally Posted by glenboy View Post
    Thats very good Ste,i get about 360miles to a tank around town,whats the mpg if i paid 88.9p a litre??? Ribbish at working these things out.......
    Just worked it out for you. 60 litres = 13.21 gallons.

    360 miles divide 13.21 gallons = 27.24 mpg

    Need to get a diesel mate. 600miles + to a tank full.

  10. #10
    Regular Member John C S's Avatar
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    Ste never did do his economy figures

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