same here ....just below 70 , good for 33-34..above this it just keeps going down !!
50-60 , can get nearly 40 but hey look a right going at that speed on the motorway !!Cheers Ian
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18th Aug 2011 10:29 pm
DaveT
Member Since: 01 Aug 2005
Location: Cornwall
Posts: 2572
0mph
Long succession of Disco's since 2001...
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18th Aug 2011 10:59 pm
kingofthesparks
Member Since: 02 Jun 2011
Location: Near Northampton m1 Watford gap
Posts: 429
Member Since: 18 Mar 2007
Location: Dorset
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SHMBO used to think.... If you drive really fast you'd get there quicker which means the engine isn't running for so long = saving.
18th Aug 2011 11:58 pm
CMG
Member Since: 12 Jul 2010
Location: USA
Posts: 956
I was going to say parked....
Parked while you get a Prius....
In all seriousness, on my gasser (which I suspect might run on a higher RPM range) it seems that if I can keep it at 3k, and about 70-75 MPG, it's good. Which is the safest speed too for here....17 Discovery 5 HSE Si6, Fuji White on brown | 07 LR3 SE 4.4 Java Black on Alpaca
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19th Aug 2011 4:41 am
Ian G
Member Since: 18 Aug 2011
Location: Merseyside
Posts: 71
I think you're all a bit high.
Not a Disco but I was once forced to drive 200 miles at 50mph after a puncture and on a space-saver wheel.
Car would normally report 28mpg, this trip I managed over 40.
19th Aug 2011 5:04 am
NickJ
Member Since: 11 Oct 2010
Location: there's no f in point
Posts: 2137
Agreed... now that we tow a caravan and have got used to slower speeds and sitting on the inside lane with all the lorries, 50-55 seems to give me the best MPG.
19th Aug 2011 5:51 am
Dave T
Member Since: 03 Jul 2009
Location: Glasgow
Posts: 6902
I believe diesels run at their most economical at 2000rpm or lower, so just under 70.Joined the BMWX5 45e group
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19th Aug 2011 6:55 am
NickJ
Member Since: 11 Oct 2010
Location: there's no f in point
Posts: 2137
Dave,
Yes, Wikipedia does have this to say:
"Engines using the Diesel cycle are usually more efficient, although the Diesel cycle itself is less efficient at equal compression ratios. Since diesel engines use much higher compression ratios (the heat of compression is used to ignite the slow-burning diesel fuel), that higher ratio more than compensates for the lower intrinsic cycle efficiency, and allows the diesel engine to be more efficient. The most efficient type, direct injection Diesels, are able to reach an efficiency of about 40% in the engine speed range of idle to about 1,800 rpm. Beyond this speed, efficiency begins to decline due to air pumping losses within the engine".
19th Aug 2011 7:09 am
haroosh
Member Since: 16 Nov 2010
Location: Perth & Kinross
Posts: 624
I agree with dave t in that for me it's a revs thing and just below 2000 revs seems to be the sweet spot. Much over 2000 and economy begins to suffer.
[quote="NickJ"]Dave,.....Yes, Wikipedia does have this to say......quote]
but are they refering to naturally aspirated diesels (now quite rare)....or turbo charged (most common)?
I have to agree its the engine revs we ought to be looking at.......so on a hilly road or motorway the average speed would vary & it may / will vary with load. Plus there is the scholl of thought that atmospheric conditions also influence engine performance (humidity & baromeric pressure)BREXIT - done properly.
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19th Aug 2011 8:00 am
euangibson
Member Since: 24 Dec 2010
Location: Borders
Posts: 11027
definitely around the 65 mark for me....unless,as already posted,you want to do an inappropriately low speed......
However if you are very careful.......
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going at that speed on the motorway !!
