Shocked by difference in fuel consumption

Discussion in 'Motorhome Chat' started by Robert Clark, Jan 22, 2016.

  1. Robert Clark

    Robert Clark Funster Life Member

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    Just did an extended fuel consumption test.

    2015 Fiat 2.3 150bhp
    6 speed manual - cruise control
    Weight 4 tons
    Full day driving on the same road

    70 mph (2500 revs) - 23mpg
    57mph (2000 revs) - 30mpg

    A little less speed, saves a lot of fuel
     
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  2. DavidG58

    DavidG58 Funster

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    double post, without even pressing anything twice? :)

    edit, then I deleted the first when I am sure I was editing the second

    there is no hope


    double edit, it keeps getting more complicated, the second post then made itself back into a draft, making me out to be a complete liar :) I feel a need for a double post thread (y)
     
    Last edited: Jan 22, 2016
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  3. Tootles

    Tootles Funster

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    Our old Hymer with the Fiat 2.5 td is returning about 28 MPG on the motorway. Quite pleased with that. Speed held at around 60 MPH.
     
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  4. DavidG58

    DavidG58 Funster

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    wow, was it the opposite direction? could make a difference maybe

    I reckon wind also makes much more difference than we realise, even a few mph head wind must take some pushing out of the way, similarly a gently shove might be helping :)

    very rarely get anywhere near 70mph in ours, but also get nowhere near 30mpg either :(
     
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  5. Robert Clark

    Robert Clark Funster Life Member

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    On the motorway only sections of the test, the average mpg increased to 33
    It's the off motorway bits at either end that made a difference
    I'm sticking to motorways where possible, all those roundabouts and traffic lights in the main roads are costing me loads of fuel, not to mention brake pads and gearbox/clutch wear
     
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  6. funflair

    funflair Funster Life Member

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    To be fair 23 mpg at 70 is OK, but I am not surprised st the improvement at less than 60.

    Ours has never seen 70 and it certainly wouldn't be doing 23 mpg, I can get that at 50-55.

    Martin
     
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  7. Judge Mental

    Judge Mental Funster Deceased RIP

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    Yeah but its boring...Also pointless paying for tolls at those speeds:)
     
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  8. Robert Clark

    Robert Clark Funster Life Member

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    I'm talking about en route to a destination rather than the shorter distances when touring
    Also a lot less stressful letting the cruise control and the satnav do the work.
     
    Last edited: Jan 22, 2016
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  9. funflair

    funflair Funster Life Member

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    So "Chill out" and don't use toll roads.



    Martin
     
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  10. Robert Clark

    Robert Clark Funster Life Member

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    Hi Martin
    To be accurate the mpg at 70mpg was only 19
    It was the off motorway bits, plus any other slow bits at either end that increased the average to 23

    Regards
     
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  11. Robert Clark

    Robert Clark Funster Life Member

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    We didn't use tolls in Spain as the motorways were fine
    We always use tolls in Italy - it's cheaper than visiting my chiropractor afterwards
    We did use tolls in France (got a tag)
    £100 from Calais to below Bordeaux
     
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  12. vwalan

    vwalan Funster

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    whats the rush.
    dont use toll roads, dont use motor ways ,try not to use dual carriageways . use small roads , drive through as many villages as you can.
    thats the way to travel in a motorhome.
    there,s always tomorrow.
    might never go over 45mph anywhere.
    make big long lines of cars behind .
     
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  13. Charlie

    Charlie Funster

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    It's boring yes but also very surprising how little time it actually adds to a journey even long ones !

    All engines have a sweet spot at which they return best MPG... Find is and stick to it and economy soars ..

    Me ? To daft to do it I go Harry flatters everywhere and pay for it at the pumps ...
     
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  14. Tootles

    Tootles Funster

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    So chill out even more, and stay in the UK. :)
     
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  15. Robert Clark

    Robert Clark Funster Life Member

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    The 'Rush' is that we only have 3 weeks per trip - so getting there needs to be quick and stress free

    While you're holding up the traffic in Calais, we're enjoying a glass on Sangria in the sun in Spain. (y)

    Horses for courses I guess
     
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  16. gus-lopez

    gus-lopez Funster

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    Then again you've probably never had an engine working correctly ? :D
     
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  17. vwalan

    vwalan Funster

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    no i dont use the calais crossing . i live 30 mls from plymouth so use ferry from there to santander .
    its cheaper by along way for me .
    and i,m there in less than 24hrs .
    its nice down here now just north of alicante . mind its got abit cloudy in the last half an hour.
     
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  18. chaser

    chaser Funster

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    We have the 2.3 engine, and when first had it checked and checked, and couldn't get anything out of the 26/28 range, whether toddeling along or going eighty down the motorway, didn't find anything made the slightest bit of difference , so never bother now, and can gauantee it will average out at 100 miles for every quarter of a tank, so fill up when we get to around 380 miles never fails.
     
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  19. Flamenca

    Flamenca Funster Life Member

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    My old Hymer 2.5td has averaged 26 mpg over the last 4,500 miles. Similarly, I rarely exceed 60mph and mainly drive at HGV speeds on dual carriageways/motorways.
     
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  20. Lenny HB

    Lenny HB Funster

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    You figures are about what I would expect as manufacturers optimise fuel consumption for 90 kph (56 mph) as that is the figures used in the EU tests that they quote in their advertising blurb.
    We don't use Autoroutes in France, well OK if they are free. Agree about Italy, on the way to Greece did the last 50 miles along the coast bone shaking experience best avoided.
     
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