Member Since: 17 Nov 2012
Location: Norfolk
Posts: 1135
Quote:
Perhaps the time to invest in an IID Tool?
Is it possible to easily return to the default settings of the car like saving a backup or something, can you do damage with them ?
What sort so money are we looking at ?Peter
1st Nov 2013 7:57 am
fishinmad
Member Since: 30 Jan 2012
Location: St Ives
Posts: 877
Spacepig wrote:
I am not sure if you are all aware of that, but the MPG test that manufacturer does are flawed by default.
1. They rarely use the same tires that they put on the car they sell and use different wheel alignment.
2. They do not follow their recommended tire pressure and tweak it to get the best of it
3. They Tape all part of the body work that could increase drag like the gap between the bonnet of the car and the body of the car.
4. Use High performance oil and lubricant instead of the one used for your car
5. Gearbox ratio are also tweaked...
The list of these tweaks is long.
As all maunfactures are doing the same thing, consumers can make an informed buying decision based on fuel comparitive economy as they are comparing like with like.
HoweverClub Narpy Torch
“No return to boom and bust†Gordon Brown when chancellor
He has been proved right, now there is only bust!
1st Nov 2013 9:38 am
Centaur
Member Since: 28 Apr 2013
Location: Rutland
Posts: 28
"As all maunfactures are doing the same thing, consumers can make an informed buying decision based on fuel comparitive economy as they are comparing like with like. "
That's what the motor industry likes to trot out whenever there's any criticism. However, my wife had a VW Eos and traded it for a Ford Kuga that had virtually identical mpg and co2 figures of around 47mpg. The VW could get (or better) that on a run, whilst constantly achieving over 40mpg around town... the Ford struggles to get better than mid-30's, even on a run.
My conclusion is that the fuel figures are just meaningless. If you want a half-decent guide as to the likely mpg of a prospective new car, have a look at Honest John's real-world mpg web page.
1st Nov 2013 6:30 pm
lespes
Member Since: 17 Sep 2009
Location: Sitting Down
Posts: 2232
As it is all done on rolling roads factors like wind resistance do not come into play and can as in the case above can be meaningless in the real world.
Which country recently decided that Hyundi had to re imburse their customers for the very inflated MPG claims they made, never catch on here, wish it would though.D4 Landmark MY16 Santorini Black THE LAST
D4 HSE MY12 Marmais Teal: Gone. Missed a lot!
Freelander 2 SD HSE MY11 Silver:Thankfully gone.
D4 HSE MY11 Silver: Gone missed !
Range Rover Sport MY06 HSE Buck Blue: Gone missed!
Discovery D2 TD5 Facelift MY Red Gone Missed!
Discovery D2 TD5 Cobalt Blue: Gone Missed!
Discovery D1 Auto Oxford Blue Not missed at all!
Discovery D1 Avalon Blue First LR! missed!
Now demoted to a VW
1st Nov 2013 8:32 pm
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
Back to topic for a moment:
Robbie wrote:
I've selected -3% as a starter for ten and will tweak from there. Mine typically displays over 37 mpg when when I am actually achieving around 32 mpg (ie 15% too optimistic).
I've now done around 380 miles with the tweak above and the display now indicates 34.0 mpg which is much closer to the 32.8 mpg that I actually achieved for the last tankful.
I have now reduced the value from '-3%' to '-4.5%' via the IID Tool (was factory set to '+7%') and I will use the next brim-to-brim to see if I can improve the accuracy further. The only downside is that the car is now very pessimistic when it comes to range calculations but I will see if that improves with use.
As an aside my last 3-tank average over 1542 miles was 32.83 mpg, so the D4 gets better and better. I have done just shy of 11k from new with a grand average of 29.99 mpg - tantalisingly close to the big three oh.
Land Rover - Turning Drivers into Mechanics Since 1948
Member Since: 03 Jul 2009
Location: Glasgow
Posts: 6902
what is your range (or combined range/distance travelled) showing now? i am mostly sitting around 34mpg (actual 27 ave) with range normally around 450 per tank (athough if i'm really a grandad then does eventually get to 480 ish) never quite made 500. Is it the same size tank as the D3? I was close on 560 miles to the tank, but did also cost a lot more to fill.Joined 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
Convoy for Heroes 2011
19th Nov 2013 8:00 am
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
The range calculation goes to pot when I reprogram and it takes a while to relearn the achievable range.
I tend to fill the car after around 470-520 miles, with the later figure being around the time the fuel light comes on. The D4 fuel tank is smaller than the D3 and I am sure the fuel light comes on earlier than the D3 too. I can be indicating single figure miles to go and even when brimming it I cannot get it close to the book figure for the tank volume. I think the D4 engine shuts down with around 4 litres of fuel left in the tank.
I'll get a screenshot of the ranges I achieve per fill.Land Rover - Turning Drivers into Mechanics Since 1948
Member Since: 08 Nov 2005
Location: Oldbury, WM
Posts: 10297
OK, so my D4's trip comp is worse than the D3's was. The D3 typically gave 2-3 MPG better reading than it actually was, but the D4 is over 4 MPG out (saying 31 when its really 27). Its also means 27 is the best I've got out of it so far, and not the 31 it was showing me.
A tad disappointed given all the crap about the D4 being more economical.
OK I didnt buy it for its economy, but right now its worse than the D3 was.
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
27th Nov 2013 5:57 pm
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
Have you got the old fashioned 6-speed box or the new thing?Land Rover - Turning Drivers into Mechanics Since 1948
Member Since: 08 Nov 2005
Location: Oldbury, WM
Posts: 10297
8 speed on mine
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
27th Nov 2013 7:50 pm
lespes
Member Since: 17 Sep 2009
Location: Sitting Down
Posts: 2232
My 6 speed MY11 used to show 27-28, out by around 4mpg all the time so real 23-24.
Eight speed one now out around 2.5-3mpg, reading 30-31mpg actual 27-28 mpg which for me is a big percentage increase.
Mainly short stop start journeys in those figures and the 6 speed box had a job to do more 330 miles on a full tank in winterD4 Landmark MY16 Santorini Black THE LAST
D4 HSE MY12 Marmais Teal: Gone. Missed a lot!
Freelander 2 SD HSE MY11 Silver:Thankfully gone.
D4 HSE MY11 Silver: Gone missed !
Range Rover Sport MY06 HSE Buck Blue: Gone missed!
Discovery D2 TD5 Facelift MY Red Gone Missed!
Discovery D2 TD5 Cobalt Blue: Gone Missed!
Discovery D1 Auto Oxford Blue Not missed at all!
Discovery D1 Avalon Blue First LR! missed!
Reading this thread makes me feel a lot better, knowing it's not just my D4 that struggles to get near the quoted mpg figures! I can manage about 33mpg average on the trip computer on A road steady driving, but motorway speeds cause the figure to drop to more like 29 average. Assuming this is 3-4 mpg optimistic, in real life I'm getting mid to high 20s, which is (just) worse than my manual D3 was
On the plus side, there's loads more power/torque, and this is an auto, so I can't complain really. Just need to avoid the instant or average MPG displays Previously:
2005 D3 2.7 TDV6 S
1984 90 2.25 Petrol CSW
1992 90 200TDi Hard Top
1995 Discovery ES 300TDi
2003 90 TD5 Truck Cab
28th Feb 2014 4:51 pm
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
I've now got the trip computer set at -7% and that seems to be the right level to be accurate.
Down to 30.5 mpg mind, so quite a drop from previous figures. I think the gearbox is less efficient than it was.Land Rover - Turning Drivers into Mechanics Since 1948
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