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urhunden
Member Since: 15 Jan 2010
Location: Stockholm
Posts: 813
  
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Hi
have a Dicovery3 TDV6-08.
My average milage is 13,75 litres/ 100 kms. equals 17,1 mpg (US), 20,5 mpg (imperial)
The on board computer calculates better than 12.0 litres/100kms. 19,6 mpg (US), 23,5 (imperial) A substantial difference.
What is wrong?
Last edited by urhunden on 9th Sep 2012 9:56 pm. Edited 1 time in total
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 8th Sep 2012 5:01 pm |
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NJSS
Member Since: 06 May 2009
Location: Catherington, Hampshire.
Posts: 10796
 
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It is generally accepted that the on-board computer is very optomistic regarding fuel consumption - in my opinion it serves very little purpose, as it isn't accurate & doesn't provide "instant" figures, merely an average over a period of time.
Your consumption seems poor but climate, driving conditions & driving style all play a part, as do tyres & their pressures. Are you doing a bit of off-road driving?
My D3 manual & is remapped by Pete Bell BAS & I get a true 25-28 mpg (Imperial).
NJSS Am I Gammon or Woke ? - I neither know nor care.
2016 Discovery 4 Landmark
2011 Mercedes Benz SL350 (R230)
1973 MG B GT V8 - 3.9L John Eales engine, 5 speed R380 gearbox, since 1975.
1959 MGA roadster - 1.9L Peter Burgess Engine - 5 speed gearbox
Past LRs - Multiple FFRs, Discos & a Series I - some petrol, some diesel,
none Electric or H2 fuel cell - yet.
There are 10 types of people in this world: Those who understand binary, and those who don’t.
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| 8th Sep 2012 5:17 pm |
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urhunden
Member Since: 15 Jan 2010
Location: Stockholm
Posts: 813
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no just doing mixed town and country driving.
Also getting Engine system failure frequently.
Error codes P023D and P0101
Kind of hopeless not finding what is wrong. Workshop has tried.
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| 8th Sep 2012 5:23 pm |
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chrisc
Member Since: 18 Oct 2009
Location: Staffordshire
Posts: 362
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I managed to get mine to average 30.1 mpg,it improved massively when I changed my driving style and also put some redex in,my main journey is mixed,mainly from stoke to Shropshire and I reset it every time I put fuel in,if someone wants do the maths I get about 780-800 miles per full tank if that makes sense
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| 9th Sep 2012 7:43 pm |
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anglefire
Member Since: 09 Mar 2010
Location: In the Club House
Posts: 4180
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Well, I'm getting about 25mpg - about 420miles to th tank, so don;t see how you're getting 30mpg and 780+ to the tank, doesn't add up. 550 would be about right.  Mark.
2006, D3 SE Auto - gone but not forgotten.
2014 BMW 530d M Sport Tourer.
1977 Triumph Spitfire 1500
_________________________________________________
Disco Picture Website Here
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| 9th Sep 2012 9:27 pm |
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A.J.M
Member Since: 31 Oct 2009
Location: Carluke
Posts: 2847
 
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chrisc wrote:I managed to get mine to average 30.1 mpg,it improved massively when I changed my driving style and also put some redex in,my main journey is mixed,mainly from stoke to Shropshire and I reset it every time I put fuel in,if someone wants do the maths I get about 780-800 miles per full tank if that makes sense
Discos have a 18 gallon fuel tank so you 780/18=43mpg.
Which seems rather high. In loving memory of FA54WSK.
Rest well old friend, your work is done.
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| 9th Sep 2012 10:21 pm |
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NJSS
Member Since: 06 May 2009
Location: Catherington, Hampshire.
Posts: 10796
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urhunden
I understand your D3 is remapped. It might be best to talk on the 'phone to the principal of the remapping business & share your concerns with him. It is quite possible to produce a different map, which might suit your requirements, including improving MPG.
The difference between calculated figures & the display is perfectly normal, mine over reads by 2 -3 mpg.
Some people have found that adding 2 Stroke oil to fuel, improves consumption - it's worth a try.
NJSS Am I Gammon or Woke ? - I neither know nor care.
2016 Discovery 4 Landmark
2011 Mercedes Benz SL350 (R230)
1973 MG B GT V8 - 3.9L John Eales engine, 5 speed R380 gearbox, since 1975.
1959 MGA roadster - 1.9L Peter Burgess Engine - 5 speed gearbox
Past LRs - Multiple FFRs, Discos & a Series I - some petrol, some diesel,
none Electric or H2 fuel cell - yet.
There are 10 types of people in this world: Those who understand binary, and those who don’t.
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| 10th Sep 2012 6:46 am |
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Eggbox Aviation
Member Since: 09 Oct 2012
Location: Aberdeenshire
Posts: 5
 
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Hi all
Im currently looking at buying a TDV6 which will be used for everyday stuff and occasional long trips. When it comes to getting the best MPG out of it is it best to stick with Manuals? From what i have heard the Auto is a bit more juicy compared to a sensible driver with a manual. Seems to me though that on a long run it shouldn't make much odds especially if you can get it to stick in 6th gear (command cruise?).
Im not sure if its the price point i'm looking at (12-14K) but there seem to be far more Autos especially in the posher HSE.
Any advice much appreciated.
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| 9th Oct 2012 10:30 am |
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NJSS
Member Since: 06 May 2009
Location: Catherington, Hampshire.
Posts: 10796
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Welcome Egg. A.
Whereabouts in Hampshire are you?
Yes - manual should give you an advantage of 1 to 2 mpg.
It seems fairly clear now that adding 2 stroke oil to fuel can add another 1 to 2 mpg.
In the last 3k miles using Castrol Actevo 2T I have recorded true fuel consumption of between 26.7 & 28.6 mpg - driven fairly hard. My D3 is 2009 Manual chipped by Pete Bell (Bell Auto Services) - currently 38k miles.
NJSS Am I Gammon or Woke ? - I neither know nor care.
2016 Discovery 4 Landmark
2011 Mercedes Benz SL350 (R230)
1973 MG B GT V8 - 3.9L John Eales engine, 5 speed R380 gearbox, since 1975.
1959 MGA roadster - 1.9L Peter Burgess Engine - 5 speed gearbox
Past LRs - Multiple FFRs, Discos & a Series I - some petrol, some diesel,
none Electric or H2 fuel cell - yet.
There are 10 types of people in this world: Those who understand binary, and those who don’t.
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| 9th Oct 2012 10:38 am |
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Eggbox Aviation
Member Since: 09 Oct 2012
Location: Aberdeenshire
Posts: 5
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Thanks for the quick response, I am currently in Ringwood.
1-2 mpg difference is not too bad from my point of view, i had imagined worse.
Interesting re two stroke oil, has anyone compared the cost of buying the oil verses the increase in MPG? Seem to remember from previous days on dirt bikes that its not that cheap!
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| 9th Oct 2012 12:10 pm |
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Gb2010
Member Since: 06 Oct 2012
Location: Tamworth
Posts: 39
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Well it's the first week of ownership and I'm well pleased with manuals mpg - 31.8 avg and rising every day. I do have the advantage of 50-70 mph motorway cruising for my daily 50mile commute!
Wonder if its been remapped by a previous owner!
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| 18th Oct 2012 8:00 pm |
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fishinmad
Member Since: 30 Jan 2012
Location: St Ives
Posts: 877
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I have an 55 pleate Auto which I have had from new, until I came on this site I averaged 22.5 MPG (on the dash reader).
However after reading the posts in here I have:
1. Balnked EGR's
2. Cleaned MAP sensor
3. Add 2 stroke Oil to fuel every 2nd fill up.
I also change oil and filter at half recomended milage and fuel and air filter once a year (it is very dusty in southern Spain and fuel quality seems to vary a bit).
I now average 24.2 MPG
I drive usually around 80 -90 mph on the motorway to and from work and we have some very steep mountains round here. I also drive on very bumpy tracks at weekends to various fishing spots.
I really would recomend the above to any one, certainly the 2 stroke oil had other benifits i.e. much improved from the lights! 
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| 19th Oct 2012 12:11 pm |
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DSL
Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 73079
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Doesn't sound too low with that speed and hills. 
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| 19th Oct 2012 1:00 pm |
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BLACK BETTY
Member Since: 18 Oct 2008
Location: Louth
Posts: 575
 
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all this talk of doing the maths
theres a really good iphone app
" Road trip "
that amongst other feaures will calculate the fuel consumption in what ever units you desire ltr / miles, ltr/km, gal/mile, gal / km etc etc
it can also be used to log service and repairs , and it all can be saved to excel too
crackin app
https://itunes.apple.com/us/app/road-trip-...98207?mt=8 Nine-tenths of wisdom is being wise in time.
Also appears 9/10 of stopping is stopping in time
http://www.youtube.com/profile?user=DiscoReaper&view=videos
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| 19th Oct 2012 2:55 pm |
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DSL
Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 73079
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Road trip is bril, esp the paid for app as it does multiple vehickles. My D3 is still showing 25.89 over 99k miles, with probably 75 - 80% of that cruising at 60mph on the Mway. 
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| 19th Oct 2012 4:01 pm |
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