Mpg.. Staggering Difference Found

Discussion in 'Motorhome Chat' started by Jaws, May 31, 2015.

  1. Jaws

    Jaws Funster Life Member

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    Today, as we were in absolutely no hurry and the road fairly flat with virtually no stops for a 100 miles, I tried an experiment
    The van has consistently returned 20 to 21 mpg ( used to be 18 to 19 mpg before I fitted a Torquing of Diesel control box ) but as is my way I wanted better mpg.. It being only a 2.3 ltr fitted in a 5t+ Autotrail I will be honest and did not really expect any decent results no matter what..

    However...................

    Today I dropped the cruise control from 55 mph ( on the GPS ) to 52 mph

    To say the results were shocking is an understatement
    Over the 109 trip the MPG shot right up to JUST over 26mpg

    That is an extra 25% for heavens sake.. and all effectively for free and for the sake of 3 MPH

    Guess what speed we will be travelling at hence forth !!
     
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  2. tofo

    tofo Funster

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    Er 60:rofl::rofl::rofl::rofl::rofl::rofl::rofl::imoutahere:
     
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  3. Johns_Cross_Motorhomes

    Johns_Cross_Motorhomes Trader - Motorhome & Accessory Sales

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    Heavy foot = light wallet as Confucious sayeth !

    Peter
     
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  4. dave newell lvs

    dave newell lvs Trader-Vehicle Services

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    As I'm sure you're aware John wind resistance is the biggest killer of fuel consumption and it increases by the square of the speed. It actually doesn't make much difference till you get above 50mph but then it increases massively. Our Iveco will do 28MPG cruising at 50MPH without the trailer but that drops to 25-26 at 56mph, at 60mph its down to 22-24mpg.

    D.
     
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  5. StitchesnFluff

    StitchesnFluff Funster

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    Worth experiment.
    Ours returns quieter journey and more mpg at 55 compared 60. Cruise makes a difference but I also let it 'run' down hills
     
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  6. pappajohn

    pappajohn Funster Life Member

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    Exactly why i sit at 52mph at 2000rpm and get around 8mpg (lpg)

    60mpg sees it down to around 6mpg.

    70mph would just not be viable.

    Cruise control makes a difference in favour but never on hills....changes down to 3rd and the revs go up to over 4000rpm so cruise gets overridden at the bottom of any hill...even on motorways.
     
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  7. Badknee

    Badknee Funster

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    Even slippery aerodynamic cars need massive power to get the really high top speeds so our bricks on wheels stand no chance (n)
     
  8. Jonkil

    Jonkil Funster

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    Mine at 100 kph does 20. At 80 kph it does 27.
    Remarkable difference.
     
  9. oldflemo

    oldflemo Funster

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    Over the 109 trip the MPG shot right up to JUST over 26mpg

    That is an extra 25% for heavens sake.. and all effectively for free and for the sake of 3 MPH

    Guess what speed we will be travelling at hence forth !![/QUOTE]

    And the cost saving only took approximately 10 minutes longer
     
  10. Gromett

    Gromett Funster

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    I get 30mpg from my van if I stick to 50 on single carriagways and 60 on motorways.
     
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  11. Tootles

    Tootles Funster

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    MY GOD!! This does 3 to the gallon! :Eeek::Eeek::Eeek:

    Handler (1).jpg
     
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  12. voyagerstan

    voyagerstan Read Only Funster

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    If you got ask the mpg you can't afford it STAN
     
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  13. Mattyjwr

    Mattyjwr Funster Life Member

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    Our camper van averages 28mpg - max 36mog when cruising at 56mph and down to 18 when at 80mph (130kmh) on French autoroutes.
     
  14. JJ

    JJ Funster

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    You dropped down 3 mph and saved 25%, John.

    So I dropped down 15mph... and my fuel tank started filling up!

    JJ :cool:
     
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  15. richr

    richr Funster

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    :ROFLMAO:
     
  16. pappajohn

    pappajohn Funster Life Member

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    Exactly......

    James May.....Buggatti Vyron.....top gear...VW test track.

    To get to top speed of 250mph it took all 1001 horses the engine could muster......and that is one slippery car.
     
  17. pappajohn

    pappajohn Funster Life Member

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    Yeah....but that weighs 32 tonnes.

    And imagine how many gallons to the mile were it a petrol engine.
     
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  18. Jonkil

    Jonkil Funster

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    Exactly PapaJohn..
    It takes more energy to push that big brick through a mass of air (motorhome, not Vyron!) . Proportionally that extra few miles per hour takes a disproportionate amount of energy that it took to wind it up to a lesser speed.
    Anyway, if I'm in a rush pull out the ZZR !
     
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  19. Ralph-n-Bev

    Ralph-n-Bev Funster

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    Ours hasn't even got 500 miles on the clock yet.
    We are enjoying watching the computerised Average miles per gallon creep up and up. It's at 29.7 at the moment.
    We've only been to Whitby goth , a couple of months ago, and Newark this weekend in Pug so far.
    We've been told it will take at least 1500 , 2000 miles before we are getting proper average miles per gallon.
     
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  20. Tootles

    Tootles Funster

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    It weighs 52 tons John, and yes, it does have a petrol engine......Well, Multifuel. :)
     
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