Fuel Consumption

Discussion in 'Motorhome Chat' started by ronald4874, May 20, 2009.

  1. ronald4874

    ronald4874 Read Only Funster

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    We have just returned from our spring break to France & Spain in our Compass Drifter 410 returning our normal MPG of 25.3 in March to 27.5 coming back in May. Over possibly 15/20 trips to Spain, in the same motorhome, the vehicle has returned very similar MPG.
    When these figures are quoted, during conversations with others, they are aghast at such a low MPG performance and often 35/38MPG for a similar weight of vehicle are bragged about. ( I will ignore those that quote 40/45MPG). It must be said we keep to about lorry speed of 90KMH and watch our acceleration.The total milage for the vehicle is only 31K and has recently been checked by Peugeot and given a clean bill of health.
    Reading the MMM from time to time its noticed that figures as low as 21/22 MPG are quoted when they carry out tests on new vehicles, that would appear to be the other extreme.
    The point is, are we being kidded by those that do not keep accurate records on their MPG. How often do we hear that on a full tank they went from X to Y which gave a figure of so and so.
    I will be writing shortly on our trip given channel crossings, roads used, aires stopped at, fuel pick ups and prices and Pyrenness tunnels for those new to travelling to France and Spain.
    Regards Ron W.
     
  2. pappajohn

    pappajohn Funster Life Member

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    hi Ron,

    id ignore those who claim 35/38mpg as well.:RollEyes:

    maybe their speedo's are in KPH and they havent realised.:Doh:

    i reckon your reading is about right.....we get 25/26mpg towing the car and 26/27mpg solo with our 2.8ltr kontiki.

    the last trip to lochness (with the toad) returned 25mpg overall. motorway and A/B roads.:thumb:

    i work mine out at each fuel stop using a calculator and again overall at the return home.

    from a previous post by me......

    955 miles = 176ltr diesel = approx 25mpg.....and towing the toad as well.
    not bad for 4.75t in scotlands hills.:thumb:
     
    Last edited: May 20, 2009
  3. nomadic

    nomadic Funster

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    We to have returned between 26 to 27 mpg part towing a toad, over 25000 miles. No longer moniter the consumption on a regular basis.

    Nomadic
     
  4. Pronto

    Pronto Read Only Funster

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    You're figures look pretty similar to mine Ron (2.8ltr Fiat based Hymer).

    I managed to get it up to about 30 mpg coming back from Spain earlier this year by keeping the speed to about 55 mph. In a rush, cruising at 65+ mph the mpg drops to about 21 - 23. I have noticed that the mpg reduces dramatically as the speed increases from about 55 to 60 mph.
     
  5. drs

    drs Read Only Funster

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    These figures are taken from a trip to France last year in a 2007 Autoquest 140 with a 2.2L 100 engine. The MPG is taken from the trip computer.
    399mls 62L 33mpg average speed 38mph
    306mls 50L 30mpg average speed 26mph
    378mls 60L 32mpg average speed 35mph
    I know the average speeds may seem a bit low but this takes into account traffic conditions. I have had an indicated 35mpg between fill ups as I usually reset the trip counter between fill ups.
     
  6. pappajohn

    pappajohn Funster Life Member

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    over that combined distance (1083mls) and combined fuel (172ltr) it averages at 28.3mpg so not as good as it first looks.:Sad:
    pretty avarage really.:thumb:
     
  7. gazznsam

    gazznsam Read Only Funster

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    weight is the biggest thing to influence fuel consumption.

    the people quoting 40mpg prolly had the empty base vehicle,

    i drove my iveco 35-10 about for a few months before my slot at the body builders came up, and averaged about 32mpg,
    now i'm lucky to get 22mpg, BUT, when i got 32mpg the van weighed a ton and a half and was kinda aerodynamic,

    Now it tips the scales at 4.3 tons (have uprated the chassis by a ton, so it's a 4.5 tonner now) and has the aerodynamics of a wardrobe trailing a parachute... luton sticking over the cab to catch the wind, body that sticks out wider than the cab, sat dish on the roof and so on.

    plus i've got an old technology mechanical injection diesel, needs more than 5 volts at the stop solenoid and it'll run till the fuel runs out (found that out when the alternator lead came off, wondered why the indicators were getting slower and slower, stopped for fuel, and all was dead, bump started it and drove to a wohnmobile stellplatz to fix... was in germany at the time and had come thru austria and was told to drive in the day with headlights on by the border guard at the swiss crossing)

    it's deffo true about the speed and mpg figures, we stick to around 55 mph, she will do 90 if needed (found out on a german autobahn) but can watch the fuel needle drop then, good job i have twin fuel tanks, get about 300 miles from each tank if we do 55, do 60+ and we need to re-fuel at around 250 miles.

    that's real mph figures from a sat nav, indicated 55 in my iveco is 50 real speed, no wonder the truckers were all overtaking us, so we do 60 indicated, and stick with them.
     
  8. errpaul

    errpaul Funster

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    Fully loaded we get 28.75mpg (2.5td Transit Autosleeper).
    I've just today fitted a roof box (hope it stays on!!), so will see how that effects things.
     
  9. pappajohn

    pappajohn Funster Life Member

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    bet you loose between 1 and 2 mpg depending on wind.:Sad:

    even a bare roofrack on a car can make a difference.
     
    Last edited: May 20, 2009
  10. errpaul

    errpaul Funster

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    That's kinda what I'm expecting. I always take the roof bars off the car when not using them. The roof box makes a massive difference on the car, but then it is designed to be slightly more aerodynamic than a MH!!!!!
     
  11. American Dream

    American Dream Read Only Funster

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    As the "aerodynamic" resistance builds up....:Sad:

    Why do they still stick (mainly) to the traditional "brick" shape?

    It certainly doesn't pay to be in a hurry.Is this why the government are looking on lowering the National speed limit?

    I normally stick to around 60-65 mph.Seems to go reasonably well then but you still find people impatient to get by.She'll do a lot more comfortably but why hurry on "B" roads?There's always the next queue up ahead anyway.

    I'd be delighted with 30 mpg.:thumb:
     
    Last edited: May 21, 2009
  12. 45eEver

    45eEver Read Only Funster

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    Ronald, of all the factors influencing average fuel consumption the fisherman's tale effect is probably the most influential.

    Anyway, have you checked you mileometre against motorway kilometer posts?

    In my experience, either

    • Kilometre posts aren't always accurate.
    • Vehicle mileometres aren't always accurate.
    My money's on the latter.

    The easiest and cheapest way to increase top speed, and reduce fuel consumption used to be to change speedo gearing.
    Anyone know if it's as easy with modern motors?
     
  13. hilldweller

    hilldweller Funster Life Member

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    Our 2l Burstner with a Luton manages 25.

    I got it down to 20 once.
     
  14. scotjimland

    scotjimland Funster Life Member

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    To be frank.. it's all a bit academic .. you bought it, if you can't afford to fill it up then sell it..

    The only reason I know what I get is because I got tired of being asked how many gals to the mile mine guzzled .. :RollEyes: so I did a check over two tank loads ..
    That's 143 gal or 650 lt. and it came out at 14. summit .. just over 2,050 mls.

    On the bright side, the toad does better than +50 mpg :Cool::thumb:
     
  15. pappajohn

    pappajohn Funster Life Member

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    50+ mpg.......have you thought about towing the RV with the toad Jim. :RollEyes::Rofl1:
     
  16. hilldweller

    hilldweller Funster Life Member

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    Are you completely thick ?

    Just put the toad at the front.
     
  17. hilldweller

    hilldweller Funster Life Member

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    Sulks !
     
  18. pappajohn

    pappajohn Funster Life Member

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    just not quick enough brian....:Rofl1:
     
  19. derekfaeberwick

    derekfaeberwick Read Only Funster

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    Not really. An empty camper and a loaded one (European 3.500kg.) generally has about 500kg. difference. That won't make as much difference as cabover v. low pro at anything much over 40 mph. As for roof boxes,:drink::cry:
     
  20. 45eEver

    45eEver Read Only Funster

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