Diesel mpg 37 on motorway run - Page 3

championdaddy · 17th January 2016, 19:58

Quote:

Originally Posted by Phil-Hex

is that at 3 figures though?

No.....

It was at a very boring and sensible 65 ish most of the way

If I just drive it.......it really about 29 LOL

oldcarguy · 17th January 2016, 20:02

My tourer diesel auto does 600 mile on a tank full and as it holds 12 gallon I make that 50 mpg or there abouts, last checked at the weekend when I drove from Yorkshire to Hastings and back.
And I personally think the FBH aids economy.

Ken Lion · 17th January 2016, 22:07

It perhaps would if your stat is working ok.
But what happens with the fbh if you have '7o/c syndrome' and the coolant stays at 70c or lower?
I know it's the ambient temperature that controls whether the fbh kicks in at start-up but at what coolant temperature does it shut off?

steve-45 · 17th January 2016, 23:01

Going to fill mine up tomorrow as the needle is down to half, but I've a feeling my MPG will have dropped too and the only thing that's changed is its got colder ....

Will put up some figures tomorrow evening .....

James.uk · 18th January 2016, 03:41

I get 44-46 mpg out of my diesel auto on long runs, and booting it doesn't really change it much unless you can keep your foot down for a long time, which is rare these days innit...

Round town the 30 mph limit means I rarely get out of 2nd gear, so 25mpg is about norm....

...

Kennyeth · 18th January 2016, 06:02

Quote:

Originally Posted by Spenrex

Long run this weekend from West Yorkshire to Lake District and back mainly motorways I got 37 mpg should I be disappointed?

You do know it has five gears ???

If your thermostat has failed then the car is running too cold.
Search here and do the IPK temp test.
Ken.

Avulon · 18th January 2016, 06:32

Leicester to Dewsbury (engine already warm) - and return journey which needed the fbh to warm things up later -- 57.6mpg on the trip with a manual gearbox. Even taken as optimistic that's over 50mpg. This was borne out by the amount of fuel used (although I didn't do a brim to brim). Manual / Auto shouldn't make a huge difference motorway cruising, unless you've left the Auto in Sport mode. Crusing speed around 75 (no cruise control, yet) - but must admit the sections at 50mph through the roadworks do help that figure.

I'm sure I could get that down to 45mpg if I played with the pedal under my right foot a bit more.

.

thundercat · 18th January 2016, 07:05

Quote:

Originally Posted by Number 6

seems a bit low to me I can regulary get 48/52 overall, motorways and B roads And I dont hang about either

Me to, so there must be something wrong.

thundercat · 18th January 2016, 07:11

Does anyone know if blanking off the top rad grill will make the engine run hotter on a Diesel.

gozo ken · 18th January 2016, 07:23

Used to get 50mpg with my manual cdt on long runs,have managed a rare 47mpg with my auto cdt,usually 44-46 ish and mid 30's around town.
I've mentioned before though-that I get more out of the auto if i put it in 'Snow; mode.
Just try it in different driving conditions--it puts it in a higher gear sooner and starts off in second.
Obviously a different driving habit has to be adopted,as you can't set off at roundabouts very quickly.
FBH is usually switched on below 12 deg to aid quicker warm up.
Ken.

18th January 2016, 06:32	#27
Avulon This is my second home 1.8t Tourer Join Date: Oct 2011 Location: Tanelorn Posts: 4,830 Thanks: 956 Thanked 1,148 Times in 916 Posts	Leicester to Dewsbury (engine already warm) - and return journey which needed the fbh to warm things up later -- 57.6mpg on the trip with a manual gearbox. Even taken as optimistic that's over 50mpg. This was borne out by the amount of fuel used (although I didn't do a brim to brim). Manual / Auto shouldn't make a huge difference motorway cruising, unless you've left the Auto in Sport mode. Crusing speed around 75 (no cruise control, yet) - but must admit the sections at 50mph through the roadworks do help that figure. I'm sure I could get that down to 45mpg if I played with the pedal under my right foot a bit more. . __________________ Need a T4 ?: T4 Owners Map thanks to Stevestrat ( use at your own risk) Where?: https://en.wikipedia.org/wiki/Tanelorn Mods/Retrofits: PCV vortex 'filter'; bluetooth; inline thermostat; reversing sensors; plenum spyhole ; headlamp washers ; Diy mp3 player replacing CD multichanger; FBH with remote; Headlamp washers; black/chrome front grille, rear blind; Xenon projectors To do: puddle lights; 2 Din cd/nav to fit; boot release button

17th January 2016, 20:02	#22
oldcarguy Posted a thing or two Rover 75 Conn SE Tourer Join Date: Aug 2011 Location: Driffield Posts: 1,952 Thanks: 27 Thanked 151 Times in 125 Posts	My tourer diesel auto does 600 mile on a tank full and as it holds 12 gallon I make that 50 mpg or there abouts, last checked at the weekend when I drove from Yorkshire to Hastings and back. And I personally think the FBH aids economy.

17th January 2016, 22:07	#23
Ken Lion Gets stuck in R75 2.0 CDT Club SE Tourer Join Date: Oct 2013 Location: Manchester Posts: 614 Thanks: 105 Thanked 101 Times in 89 Posts	It perhaps would if your stat is working ok. But what happens with the fbh if you have '7o/c syndrome' and the coolant stays at 70c or lower? I know it's the ambient temperature that controls whether the fbh kicks in at start-up but at what coolant temperature does it shut off?

17th January 2016, 23:01	#24
steve-45 This is my second home Rover 75 Saloon CDTi Join Date: Oct 2015 Location: Belvedere Posts: 4,076 Thanks: 108 Thanked 1,089 Times in 774 Posts	Going to fill mine up tomorrow as the needle is down to half, but I've a feeling my MPG will have dropped too and the only thing that's changed is its got colder .... Will put up some figures tomorrow evening .....

18th January 2016, 03:41	#25
James.uk Passed Away 2002 Pale Blue. Rover 75 CDTi Connoisseur auto. 170K miles Join Date: Dec 2008 Location: Near the M67. Posts: 14,509 Thanks: 199 Thanked 585 Times in 397 Posts	I get 44-46 mpg out of my diesel auto on long runs, and booting it doesn't really change it much unless you can keep your foot down for a long time, which is rare these days innit... Round town the 30 mph limit means I rarely get out of 2nd gear, so 25mpg is about norm.... ...

18th January 2016, 07:11	#29
thundercat Posted a thing or two Rover 75 Club SE Join Date: Jul 2012 Location: saxmundham Posts: 1,438 Thanks: 289 Thanked 173 Times in 121 Posts	Does anyone know if blanking off the top rad grill will make the engine run hotter on a Diesel.

18th January 2016, 07:23	#30
gozo ken Avid contributor R75 SALOON Join Date: Feb 2013 Location: Lincolnshire Posts: 226 Thanks: 20 Thanked 57 Times in 44 Posts	Used to get 50mpg with my manual cdt on long runs,have managed a rare 47mpg with my auto cdt,usually 44-46 ish and mid 30's around town. I've mentioned before though-that I get more out of the auto if i put it in 'Snow; mode. Just try it in different driving conditions--it puts it in a higher gear sooner and starts off in second. Obviously a different driving habit has to be adopted,as you can't set off at roundabouts very quickly. FBH is usually switched on below 12 deg to aid quicker warm up. Ken.