Do you get more mpg with or without cruise control?

Discussion in 'Motorhome Chat' started by etap, Oct 4, 2015.

  1. etap

    etap Funster

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    Having just done a few hundred miles on the motorway with out MH, I was trying to get an optimum speed to get best mpg, however, I could get at least 10percent more mpg without using cruise control , perhaps this is normal and cruise control is just to give the right foot a rest?
    Excuse this post if you think I am having a senior moment and wasting your time.
    Etap
     
  2. etap

    etap Funster

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    Sorry with OUR motorhome not with out MH .
    Etap
     
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  3. Cat53

    Cat53 Funster

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    dont know the answer, but I love Cruise Control because it maintains a steady speed up hill and down so you never creep over the limit.
     
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  4. Billy23

    Billy23 Funster

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    Cruise control? Never use that sort of new fangled stuff! (y)
     
  5. scotjimland

    scotjimland Funster Life Member

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    Cruise control does not give the best economy simply because when you come to a long incline it keeps increasing the fuel to maintain the pre set speed..
    a fuel concious driver would let the speed ease off rather than try to maintain it.
     
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  6. Ivory55

    Ivory55 Funster

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    Best thing cruise control is for average speed cameras in the road works that can last for miles.
     
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  7. scotjimland

    scotjimland Funster Life Member

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    I had it on my RV and loved it.. particularly good on French Autoroutes..

    but I used to think it was only feasible with an auto gearbox..

    how good is it with a manual box.. ?
     
  8. Forestboy

    Forestboy Funster Life Member

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    Dont know don't care CC is one of the best aftermarket accessories we've fitted to our van.
    Seriously probably a fraction less if you could drive at a set speed without CC but who the hell can do that. Mostly the speed creeps up if not you spend all your time with eyes glued to the speedo.
     
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  9. Forestboy

    Forestboy Funster Life Member

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    Mines on a manual Jim as said above a great accessory especially for us on our long trips.
     
  10. ivorantony

    ivorantony Funster

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    exactly as Jim said! a good careful driver will always improve on the MPG to a van on cruise control,
    but I always use it for long journeys and roadwork speed cameras, on hilly sections I just drive it manually,
     
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  11. Doctor Dave

    Doctor Dave Funster

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    I am sure that my MPG is better using the cruise control than not using it. My present van is an automatic, the previous one was manual. In both vehicles the accelerator movement is so small to maintain a set speed I think it would take a very sensitive right foot to make such minute adjustments. (And a sensitive eye to watch the speedometer.) I agree with Forestboy that CC is one of the best aftermarket accessories - in fact I think it is THE best.


    Dave
     
  12. pappajohn

    pappajohn Funster Life Member

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    When we collected our 1.7 ton caravan from Sheffield i drove all the way back as far as York on cruise control........after York the A64 is a cart track.

    18mpg average.

    I expect around 23 to 25mpg off cruise.

    The problem with cruise, it will do anything it can to maintain the preset speed....which usually means increased fuel delivery and downchanging, with the resulting increase in revs, with an auto box.
    Vastly increased fuel delivery to the point of HAVING to downchange with a manual box.
     
  13. Charlie

    Charlie Funster

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    I think its widely accepted that when on cruise MPG drops slightly. But we are talking one or two percent.

    I just cant be arsed to worry about that but I love cruise control. I would not have a vehicle without it.

    It works fine on a manual box it just means touching the "resume" button if you make a gear change or touch the brakes.
     
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  14. mickyc

    mickyc Read Only Funster

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    Just had ours on for a cpl of hours on the French D roads, set her to 90kph and no worries whatsoever from the old Gendarmes.

    I reckon it uses more fuel on steep uphill sections (maintaining speed)

    But probably gets some mpg back on downhills when the inevitable speed creep up is avoided.

    Ours is manual and works fine (if it's a really steep hill, do the sensible thing and knock of the cc)
     
  15. Reallyretired

    Reallyretired Funster

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    I find that I use more fuel with cruise control but less if I use the speed limiter function, as that gives the advantage of manual speed control while still ensuring the speed limit is not exceeded. A lot of cruise controls don't have this function though. My motorhome has but my car only has cruise control.
     
  16. jonandshell

    jonandshell Funster

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    I reckon economy is better without cruise control engaged.
    However, holidays are about relaxing and watching your speedo isn't!
     
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  17. Judge Mental

    Judge Mental Funster Deceased RIP

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    more I think how heavy a right foot you have....
     
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  18. Popeye

    Popeye Funster

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    It is brilliant as long as you have a torque'y engine to begin with, if you have a smaller/busier engine then you'll probably need to change down on the steep hills cancelling the benefit of Cruise.

    Those who get better fuel consumption usually achieve this because of the type of road you use Cruise on. i.e long straight higher speed roads which quite naturally would give better fuel consumption anyway.


    I retro fitted it to my last Mo Ho and if it wasn't already on my Merc Auto I would fit it again.
     
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  19. Jabberwocky

    Jabberwocky Funster

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    Supposedly you get better mpg with cc, but in reality you don't. But it's good on long journeys in clear traffic.

    Just be careful when travelling at night using it, you fall asleep and the MH keeps on going.
     
  20. sdc77

    sdc77 Funster

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    We've got cc on a 3 litre fiat. .. awesome on autoroutes and just pop into manual on steep hills then resume .
    The perfect compliment to a motorhome
     
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