Fuel consumption/speed

Discussion in 'General chat' started by DiscusbT, Feb 27, 2018.

  1. DiscusbT
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    DiscusbT

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    Yesterday I drove 83 miles from just south of Sheffield almost to Thirsk, Apart from going round Sheffield almost all motorway/dual, and with the cruise control set at a law abiding 70mph, got 37.4 mpg. That initial 10 miles does take it's toll.
    Return journey with a 28ft long 800kg trailer hung on the back, this time at a law abiding 60mph, 37.6 mpg.
    Just shows what 10mph does.
     
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  2. Alan Gunn
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    Alan Gunn

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    I must be getting old i get told when i drive along with the c/c set at 60mph.
    10-mpg less at 70mph and in my x5 30d that is a lot.
    Same result's in my 320d.
    60mph will do me fine doesn't make a lot of difference to the journy time in the end but a big difference to my wallet lol.
     
  3. kleynie
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    kleynie WARLORD Site Supporter

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    then you may as well get a Datsun Leaf ;):)
     
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  4. Mieke
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    Mieke WARLORD Site Supporter

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    I can't say what I normally set the CC to on a clear motorway, for fear of legal repercussions. :D
    Mpg is incidental, but it's averaging around 40 mpg according to the OBC.
     
  5. paz325
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    paz325

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    The M140i average 24mpg, I'm very familiar with my local petrol station.
     
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  6. pinewood
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    pinewood

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    Had cause to travel in the small wee hours over the last 3 mornings. Stuck to 65-70mph on empty Motorways/A road and icy weather.
    A very respectable 36.6 mpg from a 3.0d 4 x 4
     
  7. Kev2005
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    Kev2005 WARLORD Site Supporter Good Egg

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    I hardly ever use CC, just use my foot :) My 320D is averaging around 52mpg according to OBC, before the EGR recall it was averaging 55mpg..... Car is mostly used on motorways and A roads, with small amounts of local/town driving. On My ED I noticed a significance difference in fuel economy at 60 compared to 70, at 70 the needle went down much quicker, at 60 not so much. it seems the best fuel economy was driving at 50mph but that's not always practical... My 320D m Sport has more go and seems to want to go quicker as previously a comfortable position for my foot would see me driving around 60mph but in the M Sport it sees me drving at 70mph..... I guess that extra 27bhp makes all the difference.... I think my ED was 163bhp? and my M Sport is 190bhp if i recall correctly...

    Kev
     
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  8. DiscusbT
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    DiscusbT

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    The worst I've ever had, and quite amusing in retrospect was a Jaguar Sovreign 4.2. The 2 petrol tanks are independant, and the whole system was controlled by 3 solenoid valves, and depends on which tank you select. Excess fuel, not needed by the engine was returned to the tank in use. A valve went wrong one day, and I suddenly noticed that the fuel gauge was almost visibly going down. What happened was that the fuel was returned to the other tank, that was already full, so the returned fuel was dumped on the road via the overflow. Once the logic was sussed out, it was quite easy to live with. First empty the tank that received the excess fuel, then switch to the other tank, which quite quickly transferred fuel to the first, then switch back again.
     
  9. Cotswold BMW
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    Cotswold BMW WARLORD Site Sponsor

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    I've noticed a drop in mpg recently and put it down to the cold temperatures, but when I started seeing 37mpg I thought something must be wrong.
    Checked the coolant temperature and it's getting up to a healthy 90C while driving, but there is a fault code for "glow plug cylinder 2". I'm guessing that's to blame so it's booked in the workshop today for a replacement plug
     
    Last edited: Mar 20, 2018
  10. kleynie
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    kleynie WARLORD Site Supporter

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    I went to wales at the weekend and achieved 41mpg over 375 miles with cruise set to 70 (ish:oops:)
     
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  11. GunRunner
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    GunRunner WARLORD

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    Ah Yes. Aircrew training manual and Flight Simulator flying. :whistle:;):D:LOL:
     
  12. justin
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    justin

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    This was good for my old weekend toy:

    c5f.jpg
     
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  13. Verbarthe
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    Verbarthe WARLORD

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    I very rarely look at my MPG , but I don t do a lot of miles .
     
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  14. rigeng
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    rigeng

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    I'm the same normally, but tomorrow I'll be doing a 250 mile round trip, mainly M62/A1(M), and A689 so I'll try and remember to see what the journey computer says when I get home. I'm guessing it will be about 36-38 mpg.
     
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  15. Kev2005
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    Kev2005 WARLORD Site Supporter Good Egg

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    Did this fault come up on the dash/idrive or did you use a diagnostic tool to get the fault code?

    Thanks

    Kev
     
  16. Silverbeemer525
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    Silverbeemer525

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    Last week I drove back from near Lostwithiel to Hinckley, about 250 miles. When we got home, the journey computer showed 47mpg and 62mph. Mostly dual carriageway and motorway apart from first 8 and last 2 miles. Car is G30 530i (I need to update my picture!). I felt quite pleased with that, for a petrol engine. It's probably still a bit tight too as it's only covered 1,900 miles.
     
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  17. Kev2005
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    Kev2005 WARLORD Site Supporter Good Egg

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    wow not bad, at the moment i'm struggling to get my 320D more than 51.5mpg on the efficient dynamics read out in idrive..

    Kev
     
  18. Mieke
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    Mieke WARLORD Site Supporter

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    That's amazing! 47 mpg from a 530i petrol engine, especially as you averaged 62 mph - you weren't hanging about. (y)

    I'm struggling to get any more than high 30's mpg from my 330d in this cold weather, but that's for fairly short journeys.
     
  19. Silverbeemer525
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    Silverbeemer525

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    It drops to low 30's in mixed everyday running though!
     
  20. Verbarthe
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    Verbarthe WARLORD

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    Even low 30 s mixed driving is very good for that engine (y)
     

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