mpg 75cdt tourer

bigal83 · 23rd November 2015, 17:05

Apologies if this has been mentioned before.
my 75 (147000m) is only doing 30 mpg.

This is a round trip to work of 13 miles.
my journey to work consists of a fair few islands, stop start at junctions
and a few sets of lights.
My journey home is mostly dual carriageway with a couple of islands.
Surely it should be better than that ?

Rick-sta · 23rd November 2015, 17:06

Is yours a manual or auto?

bigal83 · 23rd November 2015, 17:45

It's a manual. It does take a long time to warm up though, I can leave home for work and by the time I get there the gauge is only about a quarter of the way to normal. Could this be the reason it uses alot of fuel?

colintf · 23rd November 2015, 17:47

Quote:

Originally Posted by bigal83

It's a manual. It does take a long time to warm up though, I can leave home for work and by the time I get there the gauge is only about a quarter of the way to normal. Could this be the reason it uses alot of fuel?

Sounds like a dodgy thermostat maybe?

marinabrian · 23rd November 2015, 17:53

Yes, check the actual running temperature using the on board diagnostics mode in the speedo.

1 Put key into ignition and turn it to position 1 (instruments activated).
1a If you intend driving with diagnostic mode active, start the engine now.
2 Press and hold the trip reset button.
3 the LCD display will show "test 1.-"
4 Immediately press the reset button every half second until you get to "test 19.-". (19.0 allows access to diagnostic mode)
5 The display will now show alternating "Log 1 -on" / "Log 1 -off"
6 While it shows "Log 1 -off" press the reset button and with no delay press the trip until you step through to test 7

This will display the temperature in degrees

Brian

steve-45 · 23rd November 2015, 17:56

Your only doing a 6 1/2 miles journey from cold every time - so 30 MPG is not really that bad !

Avulon · 23rd November 2015, 17:57

Quote:

Originally Posted by bigal83

It's a manual. It does take a long time to warm up though, I can leave home for work and by the time I get there the gauge is only about a quarter of the way to normal. Could this be the reason it uses alot of fuel?

Yep that's it. Although slow to warm up it should be up to temp by about 4-8 miles (depending on the exterior temp and driving conditions). That is to say the needle pointing at 9'o' clock - even then due to the way the needle works it sometimes isn't fully warm. Search the forum for 'diesel thermostat' and 'renault thermostat' for possible causes and solutions.

steve-45 · 23rd November 2015, 18:02

Mine is up to the half way point on the guage after about 4 miles - but the auto box does hold it in lower gears until its warmed up.

Dart2050 · 23rd November 2015, 18:31

When did you last change your air cleaner?

hotrdjon · 23rd November 2015, 18:36

my 75 cdt auto saloon with a mixture of town / motorway driving averages 45+ mpg

23rd November 2015, 17:05	#1
bigal83 Regular poster rover 75 cdt tourer Join Date: Nov 2015 Location: Tamworth Posts: 76 Thanks: 7 Thanked 8 Times in 7 Posts	mpg 75cdt tourer Apologies if this has been mentioned before. my 75 (147000m) is only doing 30 mpg. This is a round trip to work of 13 miles. my journey to work consists of a fair few islands, stop start at junctions and a few sets of lights. My journey home is mostly dual carriageway with a couple of islands. Surely it should be better than that ?

23rd November 2015, 17:06	#2
Rick-sta This is my second home MG ZT 2.0 CDTI+ in Typhoon, MG TF 135 in Typhoon & Rover 75 Connoisseur CDTI SE in Pearl Black Join Date: Oct 2012 Location: Norfolk Posts: 7,534 Thanks: 2,718 Thanked 2,827 Times in 1,462 Posts	Is yours a manual or auto? __________________ How to retrofit Cruise Control on a diesel with no OEM wiring in place: Link How to retrofit heated electric memory seats with no OEM wiring in place: Link How to operate FBH and ATC via text Link How to restore cloudy projector headlights Link

23rd November 2015, 18:36	#10
hotrdjon Avid contributor Rover 75 Saloon Join Date: Aug 2015 Location: Telford Posts: 130 Thanks: 40 Thanked 19 Times in 14 Posts	mpg 75cdt my 75 cdt auto saloon with a mixture of town / motorway driving averages 45+ mpg

23rd November 2015, 17:45	#3
bigal83 Regular poster rover 75 cdt tourer Join Date: Nov 2015 Location: Tamworth Posts: 76 Thanks: 7 Thanked 8 Times in 7 Posts	It's a manual. It does take a long time to warm up though, I can leave home for work and by the time I get there the gauge is only about a quarter of the way to normal. Could this be the reason it uses alot of fuel?

23rd November 2015, 17:53	#5
marinabrian MG ZT Join Date: Jan 2011 Location: Newcastle Upon Tyne Posts: 20,151 Thanks: 3,565 Thanked 10,837 Times in 5,718 Posts	Yes, check the actual running temperature using the on board diagnostics mode in the speedo. 1 Put key into ignition and turn it to position 1 (instruments activated). 1a If you intend driving with diagnostic mode active, start the engine now. 2 Press and hold the trip reset button. 3 the LCD display will show "test 1.-" 4 Immediately press the reset button every half second until you get to "test 19.-". (19.0 allows access to diagnostic mode) 5 The display will now show alternating "Log 1 -on" / "Log 1 -off" 6 While it shows "Log 1 -off" press the reset button and with no delay press the trip until you step through to test 7 This will display the temperature in degrees Brian

23rd November 2015, 17:56	#6
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	Your only doing a 6 1/2 miles journey from cold every time - so 30 MPG is not really that bad !

23rd November 2015, 18:02	#8
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	Mine is up to the half way point on the guage after about 4 miles - but the auto box does hold it in lower gears until its warmed up.

23rd November 2015, 18:31	#9
Dart2050 Loves to post Rover 75 Connie SE CDTI Tourer, MGF and Triumph Bonneville America Join Date: Apr 2013 Location: Stroud Posts: 443 Thanks: 321 Thanked 65 Times in 49 Posts	When did you last change your air cleaner?