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Bill



Member Since: 18 Nov 2017
Location: Essex / Normandy
Posts: 1157

United Kingdom 
Slipstreaming

A friend had a long trip Normandy Paris & slipstreamed on the way back and claimed he saved half a tank of fuel.

On my way home I played around...I have the 4.4 sdv8 ,


On the instantaneous MPG I achieved 60mpg + @ 60mph Shocked

In a bit of a hurry so tried again in the U.K. in a controlled 50mph , after two false starts following a polish lorry that wouldn’t stick to the speed limit controlled by average speed cams, & another very erratic driver, I tried again ,

I was getting 40 mpg(?????) with no slipstreams and 58 mpg for sure whilst slipping over about 5 miles

I used the cruise control with the distance set on one bar which is about two seconds.

It’s a question of picking a lorry that’s rattling along steadily, preferably also on cruise....

My normal mpg is around 30 mpg when I hammer along at the French speed limit of 80mph ‘ish Whistle

If I can halve my fuel consumption on a long French trip , I might just go for it....or I might just get bored after a while Banging Head


Anyone else going to play and report findings ?? Thumbs Up Filters are in fact so good that in certain circumstances, when the ambient air is already polluted, a diesel car will tend to extract more particles from the air than it emits. Emissions Analytics worked with........etc etc

He who dies with the most toys wins...

Post #494236 31st Oct 2018 5:51pm
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Huwrhys



Member Since: 07 Feb 2018
Location: Hornchurch
Posts: 547

United Kingdom 2017 Range Rover Autobiography SDV8 Loire Blue

I don't much fancy being two seconds behind a lorry on the motorway as I stuff my pride and joy up it's chuff. You drive a TDV8 so fuel couldn't have been a priority when you bought it. Censored the cost and enjoy it.

Post #494240 31st Oct 2018 6:03pm
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Bill



Member Since: 18 Nov 2017
Location: Essex / Normandy
Posts: 1157

United Kingdom 

Two seconds is the recommended safety gap.. and the distance used by Range Rover autopilot... with a foot covering the brake as well, it’s fine.

Not so much the cost as the staggering difference... Filters are in fact so good that in certain circumstances, when the ambient air is already polluted, a diesel car will tend to extract more particles from the air than it emits. Emissions Analytics worked with........etc etc

He who dies with the most toys wins...

Post #494263 31st Oct 2018 8:31pm
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nicedayforit



Member Since: 11 Jun 2011
Location: Beside the Solway
Posts: 3951

England 2004 Range Rover Vogue Td6 Giverny Green

When I was younger and used to take our camper van to the South of France regularly, on the way back up the motorway I used to tuck in behind a bus for considerable distances. I don't know about fuel consumption but I do remember being able to maintain good speeds with my foot almost off the accelerator, far more so than I could on my own particularly when there was a significant headwind. Don't know if I would do it now with the amount of traffic these days.

Post #494272 31st Oct 2018 9:11pm
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Alistair



Member Since: 11 Feb 2011
Location: Peterborough / Bordeaux / Andorra
Posts: 7724

United Kingdom 2013 Range Rover Vogue SE SDV8 Santorini Black

Bill wrote:
. with a foot covering the brake as well, it’s fine.


You're a braver man than me - I can live with 2 seconds & visibility, but I never like sitting directly behind lorries

It does seem like a material difference in economy though Thumbs Up

Post #494276 31st Oct 2018 9:23pm
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Sandyt



Member Since: 07 Nov 2013
Location: Wraysbury Windsor
Posts: 2212

United Kingdom 2007 Range Rover Supercharged 4.2 SC V8 Buckingham Blue

Afraid I wouldn't be able to do it I like to tramp on and it would just be too slow

Post #494283 31st Oct 2018 10:05pm
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ajac8



Member Since: 04 Oct 2011
Location: Shakespeares County
Posts: 1619

United Kingdom 2013 Range Rover Autobiography SDV8 Baltic Blue

I often slipstream when towing the tin tent. I find you don't have to be that close for it to be of benefit.

It does make a massive difference! 405 AB exec seats Baltic and Cirrus
93 RR Classic efi

Remember it's easier to get forgiveness than permission!

Gone in order:
4.4 TDV8 SE - gone to a good home
93 Classic hard dash Plymouth Blue
03 L322 Oslo Blue
2000 Disco TD5 ES Epsom Green
98 P38 Rioja Red
89 Classic Cairngorm Brown

Post #494322 1st Nov 2018 11:25am
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Gyre8



Member Since: 14 May 2017
Location: Wolverhampton
Posts: 252

England 2006 Range Rover Vogue SE 4.4 V8 Tonga Green

Otherwise called 'tailgating'.

Post #494327 1st Nov 2018 12:51pm
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Simon123



Member Since: 02 Jan 2018
Location: Pembrokeshire
Posts: 32

Wales 2010 Range Rover Autobiography TDV8 Santorini Black

Sounds pretty dangerous to me !!!!!!

Post #494344 1st Nov 2018 7:09pm
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Boxbrownie



Member Since: 19 May 2018
Location: FF gone now....FL2 i6 to play with
Posts: 245

United Kingdom 2008 Range Rover Vogue SE TDV8 Java Black

Bill wrote:
Two seconds is the recommended safety gap.. and the distance used by Range Rover autopilot... with a foot covering the brake as well, it’s fine.

Not so much the cost as the staggering difference...


It’s not slamming into the truck in front that worries me, it’s the truck behind slamming into the back of me that scares the bejeezers out of me, seen too many “scrap heaps” that have resulted from a truck sandwich Shocked David

Please let me know if my comments upset you, I may wish to upset you again.

Post #494345 1st Nov 2018 7:26pm
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Rosco



Member Since: 20 Jan 2012
Location: Beyond the wall.
Posts: 2539

United Kingdom 2013 Range Rover Autobiography SDV8 Baltic Blue

Slipstreaming and tailgaiting are two different things .

One is a good idea if you are not in a rush to get somewhere in life and the other is a good idea if you are in a rush to get somewhere not in life... I thank you Bow down

Post #494351 1st Nov 2018 8:01pm
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Full Fattie



Member Since: 10 Aug 2018
Location: Sunderland
Posts: 245

United Kingdom 2007 Range Rover Vogue SE 4.2 SC V8 Zambezi Silver

On paper it sounds like a good saving. What you also need to take into account is that you’ll be travelling at 40mph. You said yourself that you usually do 80, so it’s gonna take loads longer to get there.

I also know that lorries throw up all kinds of stuff off the road like stones, I wouldn’t wanna be behind them in mine.

Post #494352 1st Nov 2018 8:13pm
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supershuttle



Member Since: 20 Mar 2011
Location: Lancashire
Posts: 3628

England 2013 Range Rover Autobiography SDV8 Luxor

So if I slipstream in my 5.0L petrol I might get over 20 to the gallon Rolling with laughter Rolling with laughter Geoff

Post #494360 1st Nov 2018 9:23pm
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Bill



Member Since: 18 Nov 2017
Location: Essex / Normandy
Posts: 1157

United Kingdom 

Gyre8 wrote:
Otherwise called 'tailgating'.





https://www.drivingtesttips.biz/2-second-rule.html Filters are in fact so good that in certain circumstances, when the ambient air is already polluted, a diesel car will tend to extract more particles from the air than it emits. Emissions Analytics worked with........etc etc

He who dies with the most toys wins...

Post #494371 1st Nov 2018 10:54pm
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Cam-Tech-Craig



Member Since: 03 Aug 2011
Location: Gloucestershire
Posts: 16146

England 2015 Range Rover SVAutobiography SDV8 Loire Blue

I try never to follow anyone for any distances as i like the look of my paintwork and the glass... Whistle Thumbs Up

Post #494373 1st Nov 2018 11:47pm
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