Member Since: 12 Oct 2009
Location: All over the UK!
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Basically the graph curve will always show the most economical speed as 56mph - it's simple physics.
Though you will use less fuel per minute under 56mph, you need to drive for a longer time to reach your destination. Over 56mph you use more fuel per minute, but drive for less minutes. The cross over point where the efficiency is at it's best is, once again, 56 mph
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25th Apr 2014 12:56 pm
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
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I did try cruising at 56 but it's too slow for the car to stay in 6th, plus a little bit faster lets you get round the trucks.
25th Apr 2014 2:21 pm
DiscoDunc
Member Since: 08 May 2006
Location: Bristol
Posts: 16390
yep, 56 is too slow - I would die of old age before I got to my destination Duncan
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25th Apr 2014 2:22 pm
Scarab
Member Since: 11 Jun 2011
Location: Hastings
Posts: 1283
In my car it seems to get a very good MPG at 60. Once you get over 65 it starts heading south of 30MPG.
But at the end of the day life's too short and the D3 isn't, and was never meant to be, an economical vehicle.
25th Apr 2014 2:53 pm
discovery3ski
Member Since: 25 Dec 2012
Location: leicester
Posts: 735
why would you buy a discovery and then worry about economy? if the tank is big enough you will get there in one hit and not need refilling....
our porsche has such a small fuel tank - not helped by being 4wd and having a differential and driveshafts running through/under it- that the 190 mile trip we cover regularly in the land rover has to start with a full fuel tank and first job on arriving has to be to fill up....mostly we use the disco for the job. it does 85mph on cruise and returns around 27/8 mpg at that. no problem.Discovery 3 tdv6 HSE 2007
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26th Apr 2014 10:17 am
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 72898
Scarab wrote:
But at the end of the day life's too short
I look at it from the flip side of the coin. I've got all the time in the world so why rush? I find it relaxing driving at lower speeds and don't have to worry about Mr Plod and his speed gun/camera van. It's nice sitting in the comfy armchair with CC on and watch the world go past.
26th Apr 2014 10:33 am
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
I'm with Del as life feels much better cruising along.
When I yearn for a speed rush I just strap into something a little more exciting.
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Member Since: 11 May 2006
Location: Off again! :-)
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Nice for some!! Way beats my alternate mode of transport, the old Jazz.
26th Apr 2014 11:03 am
Bobs
Member Since: 29 Oct 2013
Location: Manchester
Posts: 2330
Ok weird view ...
Whats the cost between the two
In other words if you get there an hour earlier and enjoy the journey twice as much at the extra MPH and it costs £12 more ...
Is that fun and smile worth the £12 .... or not
If you are on £20 an hour or more then you have only had to work for half an hour/forty mins..... for the couple of hours enjoyment ....
When I returned form Dundee I just drove home and didn't worry about fuel .... just the safety and enjoying the road ...
26th Apr 2014 11:22 am
grzesiul
Member Since: 11 May 2008
Location: UK
Posts: 6294
and driving D3 has also priceless intimidation factor
56MPH is OK but 86 is even better for a bit more dosh spent
26th Apr 2014 11:33 am
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 72898
On a typical 500 mile haul you'd take 1hr 40mins longer (60mph vs 75mph) and you'd save £11.52 (27mpg vs 30mpg & £1.369/ltr) so cost/extra time is £6.91/hour. Not really the issue for me (cost saving) but would pay for the breakie next morning if hotelling overnight, plus I don't get there mid afternoon & end up bored stupid.
Besides, I had enough of charging all round the country in my last job & nice to watch the suits blasting past. I've had one ulcer through overworking, no intention of getting another one.
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I did try cruising at 56 but it's too slow for the car to stay in 6th, plus a little bit faster lets you get round the trucks. 
