Member Since: 28 Apr 2013
Location: Rutland
Posts: 28
Can the fuel computer accuracy be adjusted?
As many posts have pointed out, the fuel computer's accuracy is a joke - mine is running up to 15% optimistic and is far and away the most inaccurate of any car I have ever owned.
However, I ran an XC90 for a while and I had it chip tuned by RICA. I quickly noticed that the previously very accurate fuel computer readout was then running about 10% optimistic. The engineers conceded that the upgrade caused this but could only be corrected by restoring the original factory state of tune.
Nevertheless, it does suggest that the software can be manipulated to adjust the fuel computer reading up or down. Has anyone tried this with the D4 and, if so, how can it be done?
4th Oct 2013 10:40 am
bigdave Site Sponsor
Member Since: 04 Jul 2008
Location: Cornwall
Posts: 9870
Ive seen a lot on here about the mpg being very optimistic.
On MY54 D3 its always been 5% Pessimistic - tank to tank with me doing the calculations!!All things shipping, storage, transport. UK and worldwide.
Member Since: 08 Nov 2005
Location: Oldbury, WM
Posts: 10352
so both my D3's were about 3-4 MPG higher on the trip comp than actual, and this looks to be about the same on the D4 - no improvement there then
AlVolvo XC90 B5 Plus Dark
Gone - MY18 D5 HSE - Corris on 22's with Black Pack
Now gone - MY16 D4 SE Tech, Loire Blue, Almond Leather, Privacy, plus some other goodies.
Old - MY12 D4 SDV6 XS Auto - Ipanema Sand with Almond Leather - Plus other niceties, and D4.com sticker
Older - D3 TDV6 XS Auto - Lugano Teal with Almond Leather, 20" Stormers, Shiny Tailpipes, DVD/TV - and obligatory D3 sticker
Ancient - D3 TDV6 S - Tonga with Ebony, 20" Stormers, satnav & DVD
4th Oct 2013 3:51 pm
Dave T
Member Since: 03 Jul 2009
Location: Glasgow
Posts: 6910
My D3 was pretty good, less tham 1 out normally, D4 is appalling, reads 3-4 high, pointless reallyJoined the BMWX5 45e group
1994 Defender 90
2015 RRS Corris Grey/Black roof
2016 D4 Graphite Santorini Black
2012 D4 XS Orkney Grey
2005 D3 S Maya Gold
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4th Oct 2013 4:21 pm
Dinsdale
Member Since: 29 Jun 2011
Location: North Norfolk
Posts: 209
Mine's consistently about 4 mpg optimistic like Robbie. Over 2 years and 28,000 miles. So it don't get any better.If it don't fit the third time - try a bigger hammer
4th Oct 2013 5:26 pm
Dave^
Member Since: 23 Jun 2013
Location: West Yorks
Posts: 706
Member Since: 04 May 2013
Location: Stalybridge
Posts: 575
Robbie, What app is that you're using for the MPG calcs?
Looks good Lee
D3 TDV6 HSE, Bonatti Grey, 7 Seats, Dual Climate, Heated F&R Seats & Screen, Fog's , Auto lights & Wipers, SAT NAV, Harmon Kardon, Cruise, many rattles, occasional leak
D2 3.9 V8 supposed to be Green, was mainly rust. Gone but not forgotten.
4th Oct 2013 6:26 pm
Dave^
Member Since: 23 Jun 2013
Location: West Yorks
Posts: 706
Robbie wrote:
@24.9 mpg it must hurt to read it.
Oh yes!
Slightly better now I've blanked the egrs though...flickr
4th Oct 2013 6:40 pm
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 73079
I was happy when my long term average dragged its butt over the 26 mark. Considering probably 80 - 90% of that is sitting at 60mph on the motorway it's pretty painful in the wallet.
Click image to enlarge
Still, look on the bright side. At least that 50 tonnes of CO2 it's produced helped give us a nice summer!!
4th Oct 2013 6:47 pm
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 73079
Comusat wrote:
Robbie, What app is that you're using for the MPG calcs?
Looks good
RoadTrip iPhone app, as is mine.
4th Oct 2013 6:50 pm
Comusat
Member Since: 04 May 2013
Location: Stalybridge
Posts: 575
Already on app store looking for it!!
Although, just under £16K in fuel!!
Not sure I want to be reminded of how much I've burnt!Lee
D3 TDV6 HSE, Bonatti Grey, 7 Seats, Dual Climate, Heated F&R Seats & Screen, Fog's , Auto lights & Wipers, SAT NAV, Harmon Kardon, Cruise, many rattles, occasional leak
D2 3.9 V8 supposed to be Green, was mainly rust. Gone but not forgotten.
4th Oct 2013 7:04 pm
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
I save money by running the free version of the app.Land Rover - Turning Drivers into Mechanics Since 1948
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 73079
That's only part of it, I don't usually put in overseas fuel and that's probably 20k miles where it's not been entered. That's prob another £4k in juice.
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