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Resetting MPG indicator
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Amossis
 


Member Since: 31 Oct 2012
Location: A field in Yorkshire
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South Africa 2005 Discovery 3 TDV6 HSE Auto Tonga GreenDiscovery 3
Resetting MPG indicator

This might seem like a daft question but can the MPG be reset? I’m not the first owner of my car and am looking for an indication of how I am doing and stopping short of creating a spreadsheet, which seems like too much work, I don’t really have a clue.

Currently I am showing at 23.9mpg and that is running round town. Also if I pout fuel in and the computer says there is a range of 10 mile, how accurate is this? As I have got in car where light goes on and says 40mile left and then when I stop at home 9mile later it says I have 46 mile in tank Thud
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Post #10856189th Apr 2013 3:25 pm
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DSL
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Can be reset, press & hold RHS indicator stalk button in mpg mode, it'll reset. Thumbs Up

Trip comp virtually always over eggs things, in my 3 x D3s between 2 and 5mpg. Just so you feel better. Rolling Eyes
  
Post #10856209th Apr 2013 3:30 pm
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NJSS
 


Member Since: 06 May 2009
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You are best off using a spreadsheet or mobile 'phone app - the on board computer is not fit for purpose.

Brim the tank each time you fill, then it's a simple calculation with a spreadsheet.

NJSS
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Post #10856309th Apr 2013 3:48 pm
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DSL
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Yep, good old RoadTrip app on the idog&bone. Thumbs Up

Click image to enlarge
  
Post #10856319th Apr 2013 3:50 pm
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Dizzykebab
 


Member Since: 23 Feb 2013
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England 2006 Discovery 3 TDV6 Base 7 Seat Auto Buckingham BlueDiscovery 3

Just scared the crap outta my self Rolling with laughter thought ooo ill try this whilst I'm on my way to the shop pressed RHS as Del said and it squirted my window washers Rolling with laughter its the LHS in mine made me nearly pee myself giggling
  
Post #10856779th Apr 2013 5:25 pm
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DSL
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Other RHS, as I'd say to SWMBO!! Laughing Laughing

Embarassed
  
Post #10856799th Apr 2013 5:29 pm
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Dizzykebab
 


Member Since: 23 Feb 2013
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Rolling with laughter
  
Post #10856909th Apr 2013 5:40 pm
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Gurmot
 


Member Since: 30 Mar 2013
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I've just had a shock after my first tank brimming comparison. The MPG readout said 32mpg but my calculator said 26.3!!

It seems I'm not the only one to have an over-optimisitic on-board calculator, but I am surprised that owners accept this. I mean it does seem to be a "designed in" error, to make owners feel better but surely this is misleading - no?
  
Post #10857959th Apr 2013 7:53 pm
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DSL
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It's well known here that the trip comp is usually out by 2 - 5mpg, but peeps still believe it. As for "accept this", it's just one of the foibles and it doesn't affect the car, you'd be putting in the same amount whatever it said. Waaaaaaaaay down the pecking order of things that shouldn't be accepted. Whistle
  
Post #10858039th Apr 2013 7:58 pm
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bp
 


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Censored epb Evil or Very Mad
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Post #10858109th Apr 2013 8:01 pm
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BLFarrar
 


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The MPG

figure is an average....
a load of numbers that are being used in the MPG computer.....i don't know the algorithm thats in there but it updates quite frequently....less than every second....its only a "weather Vane" on a windy day.
the only accurate way is brimming the tank & keeping a log..
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Post #10858139th Apr 2013 8:02 pm
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DSL
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ESFs & Censored shutdowns. Evil or Very Mad Evil or Very Mad
  
Post #10858149th Apr 2013 8:02 pm
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Gurmot
 


Member Since: 30 Mar 2013
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United Kingdom 2010 Discovery 4 3.0 TDV6 XS Auto Stornoway GreyDiscovery 4
Re: The MPG

BLFarrar wrote:
figure is an average....
a load of numbers that are being used in the MPG computer.....i don't know the algorithm thats in there but it updates quite frequently....less than every second....its only a "weather Vane" on a windy day.
the only accurate way is brimming the tank & keeping a log..


Sorry, but I don't accept this. The vehicle is very capable of measuring both the fuel it delivers and the distance travelled along the road. These two factors are all that is needed to present a reasonably accurate measure of fuel consumption. If it was all down to averages, we would see the on-board results showing a pessimistic value as often as it shows an optimistic result but this does not seem to be the case.

It's up to each owner to decide if they are happy to wear rose tinted glasses when viewing fuel consumption but I would rather be presented with facts, or a reasonable calculation based on best endeavours. I can't help thinking that this is not the case here.
  
Post #10858249th Apr 2013 8:14 pm
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bp
 


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Censored epb Evil or Very Mad
 Don’t worry it is supposed to sound like that...honest  
Post #10858259th Apr 2013 8:18 pm
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DSL
Keeper of the wheelie bin 


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That as well! Thumbs Up Laughing
  
Post #10858269th Apr 2013 8:18 pm
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