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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17344

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
I believe that the drivetrain losses will be fairly constant regardless of speed, it is undoubtedly the brick-like aerodynamics which make the huge difference in consumption between say 50 mph and 60 mph, or 60 mph and 70 mph. This is because, as gilpinxit pointed out, the aerodynamic drag is exponential, increasing in proportion to the square of the speed.
Post #961473 12th Aug 2022 7:36pm
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90 Dreamer



Member Since: 13 Jul 2019
Location: Oop North
Posts: 2140

United Kingdom 2016 Defender 90 Puma 2.2 HT Corris Grey
In very unscientific testing I achieved approx 5mpg more travelling at circa 60mph rather than 70mph...
Post #961474 12th Aug 2022 7:43pm
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Rashers



Member Since: 21 Jun 2015
Location: Norfolk
Posts: 3484

United Kingdom 2014 Defender 110 Puma 2.2 USW Corris Grey
Every day is a school day Thumbs Up

Standard MY2014 110 Utility XS with no roof rack or bars on factory fitted Conti's 330-360 miles to a nearly empty tank.

Long runs are marginally better of MPG but then I suppose I drive a little faster on the long runs than the short trips I do.

Never managed much more.

Without wishing to stir up many an old post, but I try to run non-supermarket diesel (usually BP) and I dose Millers at every fill up. One or the other (or maybe a mixture of both?) appears to give me another 20-30miles to a tank. not sure how or why, but it does and the engine sounds a lot sweeter for one, the other or both Laughing
Post #961475 12th Aug 2022 7:49pm
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The Zee



Member Since: 26 May 2019
Location: Salisbury
Posts: 289

United Kingdom 2014 Defender 110 Puma 2.2 USW Indus Silver
Off Topic

There is a difference in fuels supplied to different brands of service stations, the base stock of fuel is very similar, and meets the EN spec (590 for diesel) but the additive blend (detergents, inhibitors, lubricants, cetane/octane improves) added to that base stock varies depending on brand and grade.

Forensic fire investigators can use this unique fingerprint to ID the source of the fuel if needed.

Sorry to wander off topic.... Zaid-M
www.DefencePhotos.com
2014 Defender 110 Utility, 2.2 Puma, Indus Silver
Not just transport more like a religion
Post #961478 12th Aug 2022 8:12pm
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Minch90



Member Since: 15 Sep 2017
Location: Gloucestershire
Posts: 236

United Kingdom 
Used to get 8-12mpg in the V8 LWT so whatever the mapped 2.4 does is much better 😂😂 2.4TDCI 90 - everyday brilliance
S3 V8 Lightweight - in the garage being ignored #newchassistime
S3 lightweight - 2nd car 24V fire risk with a full tilt and the windscreen down
S1 80" - first car fun - 75mph in neutral downhill once #wobblesallround
Post #961482 12th Aug 2022 9:14pm
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Dinnu



Member Since: 24 Dec 2019
Location: Lija
Posts: 3409

Malta 2012 Defender 90 Puma 2.2 CSW Santorini Black
On this link is a list of the coefficient of drag of a few cars. The higher the number the worse it is.

https://en.wikipedia.org/wiki/Automobile_drag_coefficient

Can also use this link to calculate the drag at different speeds. Typical air density is 1.29kg/m^3.
Defender frontal area is about 3.62m^2.

https://www.omnicalculator.com/physics/drag-equation

One may see how rapidly the drag goes up with speed. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black
Post #961496 13th Aug 2022 4:31am
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Julie



Member Since: 07 Oct 2017
Location: Nantes
Posts: 479

France 2012 Defender 110 Puma 2.2 SW Keswick Green
350...400 miles on long runs - dépends on how the wind blows Whistle

With 5seats, km3s and camping equipment (2nd batt, ice box, furniture behind the 2nd row) and a roof tent behind a 4ft long roof rack ...

And if I fill thé 2 UNO jerrycans ( one on each side) it'll be more than 600 (on the road) Cool

P.S. 110 2.2 low power version without mods
Post #962920 25th Aug 2022 8:11pm
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Timcat



Member Since: 20 Jul 2016
Location: Rugby at the moment
Posts: 1025

United Kingdom 2012 Defender 110 Puma 2.2 SW Indus Silver
Interesting reading, we run a 2.2 puma camper heavily loaded ( inc the kitchen sink Rolling with laughter) we average 22mpg & max speed is 65mph.
One interesting thing to note, we followed a 20t overland truck for a lot of miles & returned 28mpg! Not sure it was because of the slower speed or we were slip streaming him ( very tall & wide)
Post #964049 5th Sep 2022 8:31am
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LandRoverAnorak



Member Since: 17 Jul 2011
Location: Surrey
Posts: 11324

United Kingdom 
Many years ago I followed the Trailmasters truck through Morocco and managed in excess of 40mpg in my heavily loaded 300tdi Discovery. It's definitely the slow speed rather than slip streaming, as that effect is negligible at slow speeds. Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia
Post #964051 5th Sep 2022 8:38am
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nicam



Member Since: 14 Dec 2007
Location: deepest Lancashire
Posts: 156

2015 Defender 110 Puma 2.2 USW Aintree Green
In 100,000 miles in my 2015 2.2 I always reckoned to get 150 miles by the 3/4 mark on the gauge, 250 by halfway and 350 by 1/4 mark and then it depended how brave you were, but usually filled up as the light came on around 400 - 420. It always averaged around 29mpg worked on speedo mileage and full tanks.
I`ve now put an auto in it (as it has retired from the high mileages of its first 5 years of life and mpg has dropped (like a stone!!!) but then it does town work and slower speeds generally now and a bit more towing. I don`t like to think about it but have used a tank down to needing to fill up in under 250miles! Don`t drive faster than your angel can fly!
Post #964077 5th Sep 2022 12:46pm
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carpetsauce



Member Since: 19 Mar 2021
Location: Essex
Posts: 58

United Kingdom 
Over 18 months in my 2.2TDCi with the JE 6 speed auto I’ve averaged 26.1mpg. (7805 miles, 1298 litres makes about 6 ml/litre). Roughly even mix of light town and dual carriageway/motorway. On open roads I stick to around 2000 to 2200 rpm which equally 60 - 65 mph. Tank only holds 57 litres so I start looking to refill at 300ml. Lovin’ it.
Post #964117 5th Sep 2022 7:22pm
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