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dondiddy

Member Since: 13 Nov 2012
Location: Hamilton
Posts: 224

At work a couple of years ago we had government subsidied training on eco driving techniques from The Energy Saving Trust. There was some impressive improvements in fuel economy (up to 25%) in the before and after driving but the techniques that they taught were (for me and most of my co-workers) very,very hard on the vehicle as they taught you to use all the torque of the engine and drive along in the highest possible gear as soon as possible and stay in that gear even when the engine was labouring. I have always driven with mechanical sympathy for my vehicles and the mechanic in me could not bring myself to "abuse" the vehicle in this way regardless of the savings.I believe that any fuel saving using this driving style would be offset by increased repair bills on your vehicle. Reading the road ahead more was one of the better things that was taught as that had the bonus of making your driving safer as well as more fuel efficient but I could never bring myself to drive with the vehicle shuddering along at 800rpm in 6th gear at 30mph just to save a few extra mpg! My everyday driver is a 2003 Clio 1.5DCi with 171,000miles on it and it still manages to average 73mpg!

14th Jun 2014 9:30am

Caterham

Member Since: 06 Nov 2008
Location: Birmingham
Posts: 6298

2011 Defender 110 Puma 2.4 XS CSW Stornoway Grey

very good economy

not only do I try and save fuel (incase you hadn't noticed) but I also try to reduce brake pad wear....when approaching islands at the end of a fast / dual carriage way for example I use engine braking and sometimes turn the a/c on to increase engine braking

18th Jun 2014 12:07pm

dudley472

Member Since: 15 Nov 2012
Location: wolverhampton
Posts: 96

2009 Defender 90 Puma 2.4 HT Keswick Green

yes I'm pleased with the mpg I'm getting, as I say it took a while to get my technique, just sticking it in the highest gear isn't the way to go, I rarely use 6th for instance unless I'm doing over 50 I use the torque app on a cheap android tablet that lives in the truck, but over 30 purely urban is pretty pleasing and yes engine braking, I never dip the clutch and coast because the engine then ticks over which uses fuel, albeit a small amount, just taking your foot off the pedal stops the fuel flow and you use none, I have a re map which I reckon helps, it increases torque mine is "farmer spec" so I don't have air con

I've always watched my mpg since I've had a defender no idea why, I took a greater interest when I fitted a piggy back ecu chip to my old td5 and instantly got another 3-4 mpg so now without going bonkers I like to drive in a fuel efficient way, I have big tyres on my puma too so I probably show a lower mpg than I would with the smaller stock wheels and tyres

18th Jun 2014 6:16pm

borderterrier

Member Since: 09 Dec 2011
Location: Surrey
Posts: 1677

2013 Defender 110 Puma 2.2 XS CSW Aintree Green

dudley472 wrote:
I change up at just below 2000, I have a re map from monster tuning, which I think helps, the bigger wheels make the mpg figures more accurate as it seems to make the speed and therefore mpg read spot on rather than optimistic with stock wheels, its not a case of just driving carefully there is a definite technique to getting good mpg, its more about the right gear for a given speed, it took me a while to suss it, letting the torque drag you along efficiently is the way to go, on the motorway I'd probably get high 20's but I wouldn't be doing 45...

My speedo is bang on with stock wheels.

18th Jun 2014 9:08pm

Caterham

Member Since: 06 Nov 2008
Location: Birmingham
Posts: 6298

someone somewhere asked about my mpg while towing so here's a few stats;

b'ham to Eash coast then towards Lincoln plus pottering around East coast - 346 miles (c 246 with heavy caravan).

took 61 ltrs to refill - so approx. 25.8 mpg.

26th Aug 2014 12:23pm

Fabio

Member Since: 05 Aug 2011
Location: Somerset
Posts: 589

2011 Defender 110 Puma 2.4 XS CSW Santorini Black

Mine did about 400 miles to a tank... Going to wales and back home!
Very good i'd say...

Air con on most of the way.

Fabio

26th Aug 2014 6:16pm

martinfiattech

Member Since: 13 Nov 2013
Location: leicester
Posts: 422

Whilst admiring the fuel efficiency and endeavours therein.

I`am a little bit worried about people slip streaming trucks (if I read this right ). Having being rear ended twice by tail gaters it`s not much fun. On one occasion I was driving a 7.5 tonne truck, had to pull up quick due to a child slipping from her mothers hand thank fully I missed her ( she was 4 foot away from my front number plate).
Then the bang a car went right under my rear, he was removed on a spinal board......

It may be all well and good saving a few quid but if something were to fall of said truck or trailer you may not be able to react in time. And the stone chips.

The idea of engine braking sounds short sighed as we all know the weakness of the clutch springs, not mention the rest of the gearbox is a bit iffy, turning the air con on will do little as the compressor is cycled on and off under normal conditions.
The condenser fan will use little power as it`s already turning from the forced air flow as we know it takes a lot less to run a motor than to start it.

All this low rpm engine use may cause more long term harm than good, even if the high pressure pump holds together by running low on diesel I would not be happy pulling fuel from the base of my tank / filter. Excuse the spelling I`am better with spanners and wires.

27th Aug 2014 8:06pm

mark_d

Member Since: 07 Sep 2013
Location: Northern Ireland
Posts: 266

2010 Defender 90 Puma 2.4 XS CSW Santorini Black

dudley472 wrote:
I never dip the clutch and coast because the engine then ticks over which uses fuel, albeit a small amount, just taking your foot off the pedal stops the fuel flow and you use none

This was my understanding of modern diesel engines and I drove according to help mpg.
I fitted an ultragauge recently, and whilst it isn't calibrated yet, it does show relative changes in mpg.
What confuses me is that the instantaneous mpg shoots up when I press the clutch pedal and the revs drop. It seems that it is more efficient to coast
Does anyone know how the ultragauge calculates fuel economy? http://defender90xs.blogspot.co.uk/

27th Aug 2014 8:33pm

Caterham

Member Since: 06 Nov 2008
Location: Birmingham
Posts: 6298

Not sure the scan gauge works but not very well from what you have said.......
Can't say 100% this is the same with all modern diesel engines but the golf we have - you can clearly hear the pump / injectors when coasting but not when decelerating in gear if that count for anything?

Quick update date....at 323 miles and half tank left

Click image to enlarge

30th Sep 2014 7:45pm

rustyboxx

Member Since: 08 Oct 2012
Location: Poole
Posts: 548

2015 Defender 90 Puma 2.2 CSW Montalcino Red

So what mpg would you get if you dropped the spinnaker and took the mast down?

2015 90 XS CSW TDCi - Beautiful
2007 110 XS DCPU - An itch that needed scratching
2005 90 Td5 XS CSW - Utterly brilliant
2001 Discovery 2 ES Auto - A phase I went through
1996 90 Tdi CSW - Uber reliable
1989 90 2.5 Petrol Hardtop - My first proper Landy
1985 Range Rover Vogue V8 -Troublesome

30th Sep 2014 7:52pm

Caterham

Member Since: 06 Nov 2008
Location: Birmingham
Posts: 6298

Not sure, but with it up about 38

Will hopefully have enough pennies for a bigger intercooler, remap and decat which I hope may improve things further?

I need to drop my mate a note shortly too as I think he was struggling to make up in his c220 today

.....only for a few runs out of some islands up to c70mph.

30th Sep 2014 8:20pm

Caterham

Member Since: 06 Nov 2008
Location: Birmingham
Posts: 6298

wow.....how about that for consistency.

check this photo with the one above

Click image to enlarge

26th Oct 2015 11:06am

jimbob7

Member Since: 06 Jul 2013
Location: uk
Posts: 2055

Pov.spec,ftw. 2006, 110,TD5.

26th Oct 2015 11:25am

K9F

Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610

2008 Defender 90 Puma 2.4 XS CSW Stornoway Grey

Caterham wrote:
.....check this photo with the one above....

Wow now that is finally impressive, over 21,000 miles without using any fuel whatsoever with the handbrake on! That'll be why the temperature is up. Think you've an issue with the trip meter though, best go investigate and start a thread forthwith?

If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!

26th Oct 2015 11:32am

Caterham

Member Since: 06 Nov 2008
Location: Birmingham
Posts: 6298

with a thread like that you're clearly in good form Mal (at least I trust you are?).

things are going really well at the moment (although saying this is probably going to scupper things) so lets just see how long it lasts

26th Oct 2015 12:26pm

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