Member Since: 25 May 2005
Location: East Scotland
Posts: 1464
My average MPG was around 28 until last 2 weeks when it plummeted to 25.6. Same routes same work but Tesco fuel. Winter diesel? Esso standard today and back up to normal range.
I have noticed the same I have just had my software upgraded and I had shell fuel left in my tank about quarter full drove 17 miles home on M55 at 70 mph, the average fuel when I pulled off on to the slip road was 30.5 mpg.
I filled up yesterday at morrisons and its dropped to 25.5, it does make a difference on the quality of fuel you put in.
I first noticed this on a trip to Scotland when I had Asda fuel in it then I filled up with Shell diesel Extra and got better mpg.
On my V8 petrol LR3 the maximum I can get is 17MPG
But the speedometer is usually about 200KM/H '05 LR3 HSE V8 - Adriatic Blue - Larini Exhaust System - Lamp Guards - Dual battery system - Hidden 12k winch - Rasta Sump Guard
Last edited by Q8_LR3 on 13th Nov 2006 1:49 pm. Edited 1 time in total
13th Nov 2006 7:53 am
caverD3
Member Since: 03 Jul 2006
Location: Oberon, NSW
Posts: 6922
Mine got a corrupted software file post enhancement and dropped the upgrade (back to magic carpet ride etc.) fuel economy went down as well. I was getting 11.5 on freeway runs at 120kmph
recently the ccolant sensor went sotware upgrade for suspension went but engine performance improved. Fuel economy went from 12.5 to 16-17 around town it then settled back to 13.5 Back to dealer on 20th.
maybe he has a software issue.“There are only three sports: bullfighting, motor racing, and mountaineering; all the rest are merely gamesâ€
Ernest Hemmingway
D4 3.0 Active Diff, Adaptive Lights, High Beam Assist, Surround Cameras, Privacy Glass.
D3 2.7:Adaptive Headlights,Electronic Rear Diff,ARB Bar,Blaupunkt Speakers,JVC Powered Subwoofer,Removable Snorkel,Mitch Hitch,Pioneer After Market Head Unit,Steering Wheel Control Adaptor,Remote Adjustable Supension Rod System, Taxside Dual Battery System.
13th Nov 2006 8:12 am
Flying Brick
Member Since: 05 Nov 2006
Location: Madrid
Posts: 25
I'm not shocked at all about diesel. I've driven 1500 Km. this weekend, mostly highway, and found very, very reasonable figures, if not excellent for a vehicle the size and shape of ours...
Mine (auto) is actually spending 9 - 9'5 l./100 Km. cruising on the speed controller at 132 Km./h. (speed limit regulation in Spain) which translates to 31'39 - 29'73 mpg (british) cruising at 82 Mph (british).
I expected substantially worse figures for such a huge car.
Off-road consumption is something I will see, but I'm not really concerned.PG'ed
13th Nov 2006 9:38 am
nobbyclark
Member Since: 03 May 2005
Location: Perth, Scotland
Posts: 1268
I got 497 miles from just over 3/4 of a tank, pre-enhancement (London to Lochgilphead). Post-enhancement, I did about 620 miles on a whole tank (Perth to London and then some local journeys). Motorway MPG is definitely much better (10%+), but I would say around town it is about the same, probably because I am using the more spritely behaviour a bit too much.No longer a D3 owner but still subscribed to multiple threads!
13th Nov 2006 1:41 pm
croyde
Member Since: 17 Aug 2005
Location: SE England
Posts: 459
Mentioned the low mpg to my, now old, dealer today and he said that he had never come across such a problem.
He had never come across the sinking seat problem either, forgivable if they were at the back of beyond but Guildford is hardly the boondocks.
13th Nov 2006 7:00 pm
LT
Member Since: 31 Dec 2005
Location: South West
Posts: 23368
My mpg seems to have dropped recently. Being a diesel "newbie" does winter diesel really make any difference?
Well 1000 miles in and I'm on an Avg of 30.1 MPG in my TDV6...
This has been round town, A-roads and two long runs on the M40 and A34. This evenings run was 90+ and I did drop to 28.9 !!"To finish first, one first has to finish ...."
13th Nov 2006 10:24 pm
suevite
Member Since: 15 Oct 2006
Location: Surrey
Posts: 69
Mileage for my TDV6 was over 30 last month, but has now steadily dropped a little.
However, it is still really good I think, at around 28 mpg on mixed A roads and short to medium trips 2-20 miles. Mind you I am still driving with a light right foot, but its fun to boot it occasionally! Don't put it off, go for it!
13th Nov 2006 10:34 pm
suevite
Member Since: 15 Oct 2006
Location: Surrey
Posts: 69
Windage!
Windage seems, predictably, to have a big effect on mpg. A 15 mile trip south down the A3 to Guildford at 70 in a headwind gave 28 mpg (Q8 diesel).
Re-zero on departure and returning back up the A3 (again 70), now with a strong following wind, and including a refuel stop (BP ultimate) gave 40.5 mpg - Highest I have ever seen. Sounds incredible, but the average (28+40)/2 gives 34, which is what it says in the book.
SO, no magic, but a strong suggestion that the "brick" is as poor aerodynamically as one might imagine! Helped I guess by the better fuel also.Don't put it off, go for it!
I just filled my tank. Said my range was 257 miles. I averaged 13.0mpg on the 5 mile trip home.... 2005 Zambezi V8 SE
17th Nov 2006 12:26 am
ChiefCheese
Member Since: 03 Nov 2006
Location: Hampshire
Posts: 1
Can anyone explain how the computer calculates mpg?
I mean, is it a rolling average or is it cumulative? I presumed at first it reset when the trip zero'd at 1000 miles, as it seemed to do so when I manually reset the trip. Now I'm not so sure.
First couple of thousand miles I had it the mpg was quite variable but more recently, it varies between 22.5 & 22.8 mpg at most. I'm mostly doing short journeys, up to 10 miles, but doesn't seem to make much difference if I take it on a 300 mile motorway trip.
Can anyone explain how the computer calculates mpg?
The computer works on an average across the period until it is re-set. Push and hold the left hand (indicator) stalk button for two seconds to reset all the info display - including average MPG. OTOH, The trip meter (below the mileometer) works independently and is reset from the button protruding from the perspex screen.
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it then settled back to 13.5 
