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Fuel consumption
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andy370
 


Member Since: 15 Apr 2010
Location: Barrhead
Posts: 18

Scotland 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Alaska WhiteDiscovery 4
Fuel consumption

Hi,
I have a 2014 D4 HSE Lux which I've had for 5 years.
The first year the fuel consumption was around 32mpg solo and towing around 24-25mpg.
After the first year the consumption for either solo or towing dropped to 16-18mpg, and still the same. The fuel filter hadn't been changed, but even after that was done, the consumption remains the same. Nobody seems to know what's wrong, not even mechanics. Any ideas apart from maybe injectors.
Thank you
  
Post #234809017th Sep 2023 1:54 pm
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NJSS
 


Member Since: 06 May 2009
Location: Catherington, Hampshire.
Posts: 10592

United Kingdom 2016 Discovery 4 3.0 SDV6 Landmark LE Auto Waitomo GreyDiscovery 4

How do you calculate fuel consumption?

NJSS
  
Post #234809117th Sep 2023 2:00 pm
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andy370
 


Member Since: 15 Apr 2010
Location: Barrhead
Posts: 18

Scotland 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Alaska WhiteDiscovery 4

Hi,
I fill fuel tank up, reset mileage recorder, then fill tank again when low
Thanks
  
Post #234809217th Sep 2023 2:05 pm
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kim0785b
 


Member Since: 12 Feb 2021
Location: London
Posts: 134

United Kingdom 2015 Discovery 4 3.0 SDV6 SE Auto Santorini BlackDiscovery 4

What fuel do you use? V-power fuel gets about 3-5mpg more mileage on my D4. Accelerates a lot smoother also. I'd recommend perhaps a carbon clean and check the condition of the spark plugs!
 Discovery 4
Oct 2015, 2016 build
SDV6 Santorini Black SE
New engine at 42k
Car camper 
 
Post #234886927th Sep 2023 2:11 pm
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andy370
 


Member Since: 15 Apr 2010
Location: Barrhead
Posts: 18

Scotland 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Alaska WhiteDiscovery 4

Hi, thanks for your reply.
În answer to your question about what type of fuel, it makes no difference whether it's Shell, BP, or any supermarket and in answer to your second comment, it's a diesel engine, so it doesn't have spark plugs. No Discovery has spark plugs.
  
Post #234887627th Sep 2023 3:24 pm
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rrhool
 


Member Since: 28 Aug 2014
Location: Norfolk
Posts: 4438

United Kingdom 2007 Discovery 3 TDV6 SE Manual Zermatt SilverDiscovery 3

Quote:
No Discovery has spark plugs


Apart from the petrol ones Whistle
 Richard


D3 SE 2007. Triumph 2.5Pi 1973. Ferguson TEA20 1948.



Discovery 2 4.0 ES 2001- Gone
Discovery 1 300Tdi ES '95 - Gone
Range Rover Classic '79 - Gone 
 
Post #234887727th Sep 2023 3:29 pm
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Trailered Movements
 


Member Since: 16 Jan 2020
Location: East/West Sussex Coast Borders
Posts: 1200

United Kingdom 2011 Discovery 4 3.0 SDV6 Commercial Auto Sumatra BlackDiscovery 4

If you get the same mpg with supermarket fuel and Shell, then I'd say it's an operator induced problem.

Normal Shell and BP will always improve mpg, their respective 'power' fuels options should even improve mpg more.

Apologies if this sounds harsh, but many thousands of 'petrol heads' (including diesel) will testify that performance and economy are inproved using these brands, and tests by many different sources also back this up.


Dave
 2011 Discovery 4 Commercial SDV6 (Gone)
2010 RRS TDV8 (Gone)
1980 OBLIC 4.0ltr Range Rover (went a long time ago) 
 
Post #234888027th Sep 2023 3:38 pm
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Nasher
 


Member Since: 07 Mar 2009
Location: Clanfield, North of Pompey - UK
Posts: 2734

England 2016 Discovery 4 3.0 TDV6 HSE Lux Auto Loire BlueDiscovery 4

But there's a huge difference between 32mpg and 16-18mpg, that surely can't be down to what fuel the OP is using.
 Heaven doesn't want me, and hell is afraid I'll take over.  
Post #234888127th Sep 2023 3:47 pm
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andy370
 


Member Since: 15 Apr 2010
Location: Barrhead
Posts: 18

Scotland 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Alaska WhiteDiscovery 4

That really is my problem. Whether there is/isn't better consumption with she'll etc or not, I think a drop from 32 to 18mpg is quite a drop, in one go, but thanks for all your chat
  
Post #234888527th Sep 2023 4:44 pm
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DIY Ace
 


Member Since: 06 Feb 2019
Location: Hampshire
Posts: 965

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Bonatti GreyDiscovery 3

Do you have a diagnostics tool? Might be worth checking injector values as you may be burning the fuel inefficiently if they're not working well.

Also clean the various sensors, MAF etc. I have a well worn 2005 and get 25+ from it, you should be getting better than that.

Otherwise, fault codes and a GAP tool are your friend for seeing what's going on.
 2022 BMW i4 M50. Bought Oct 2022. 10,200 miles and counting...
2014 BMW 435d convertible. Bought July 2021. 58,000 miles and counting...
2005 Discovery 3 HSE Auto. Bought Feb 2019. 169,000 miles and counting...
2009 Freelander 2 XS Manual. Bought Sep 2013. SOLD Aug 2021 (already regretted!)

https://youtube.com/channel/UCO_u_0D45x9KGfiNstzLJnw 
 
Post #234889827th Sep 2023 6:47 pm
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andy370
 


Member Since: 15 Apr 2010
Location: Barrhead
Posts: 18

Scotland 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Alaska WhiteDiscovery 4

Thanks for your advice. I had thought about the injectors but will need to get them checked.
  
Post #234890827th Sep 2023 8:12 pm
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RogB
 


Member Since: 15 Jun 2018
Location: Mansfield
Posts: 1682

United Kingdom 

could anything be binding slightly and causing drag?..... brakes, transmission etc ?

are you losing fuel somewhere through a split pipe or connector ?


im no mechanic by any stretch so just throwing a few more juggling balls into the mix.
 2011 D4 XS 305 MY12 - gone but not forgotten  
Post #234893128th Sep 2023 7:45 am
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andy370
 


Member Since: 15 Apr 2010
Location: Barrhead
Posts: 18

Scotland 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Alaska WhiteDiscovery 4

RogB,
Thanks for your suggestions, but all these are checked, working and no leaks.
  
Post #234893928th Sep 2023 9:04 am
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Kieran995
 


Member Since: 31 Jul 2022
Location: Bathgate
Posts: 8

United Kingdom 2012 Discovery 4 3.0 TDV6 XS Auto Barolo BlackDiscovery 4

Hi Andy,

Have you tried dipping your tank to see how much fuel is left? i have a similar issue where mine likes to throw up a low fuel warning light and mpg is 23-24 (apparently) but if you leave it for a bit and switch back on fuel light goes away and range increases, its a strange one and im thinking it could be getting misread, perhaps its the same for you? computer not reading it correctly and you actually have more fuel?

(Not a mechanic just my input)

Cheers
Kieran
  
Post #235082219th Oct 2023 10:22 am
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Carl and Petra
 


Member Since: 13 Feb 2015
Location: Hautes Pyrenees
Posts: 219

France 2015 Discovery 4 3.0 TDV6 SE Auto Sumatra BlackDiscovery 4

Or…have you double checked your calculations?

I suspect you have but ….

And as a comparison we get 26mpg on our 2015 D4 SE.
  
Post #235082819th Oct 2023 11:07 am
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