28mpg :( - Page 5

peelaaa · 28th February 2009, 19:21

Quote:

Originally Posted by NikTheGeek

Right, update:

1. Replaced air filter
2. Cleaned PCV valve
3. Cleaned and then disabled EGR valve
4. Put redex in the tank

Using the same garage and even the same pump

the fuel economy has gone from 28.1mpg to 31.5mpg so not the massive increase I was hoping for.

I still have a potential maf issue, although with no benchmark it is hard to tell if its working or not - acceleration seems fine, there is a slight delay as the auto box kicks down, but if I accelerate slowly there is no delay at all.

Other than that, anything else to try to improve the poor mpg?

tnx

Nick

I heard that some makes of tyres cause poor fuel consumption, what brand do you have?

baggie9 · 1st March 2009, 19:06

Hi Nick,I have only had my 75 since january 2nd.My mpg before fitting synergy2 ,new pb maf and pcv valve ,purchased of ebay same pcv as the freelander for £22.50P .Was in the low thirties and the car was dangerous puling out on busy junctions.THE

baggie9 · 1st March 2009, 19:16

Quote:

Originally Posted by baggie9

Hi Nick,I have only had my 75 since january 2nd.My mpg before fitting synergy2 ,new pb maf and pcv valve ,purchased of ebay same pcv as the freelander for £22.50P .Was in the low thirties and the car was dangerous puling out on busy junctions.THE

sorry hit the reply button.The maf I took out was a copy.The egr was clean so it looked as if the previos owner or garage had cleaned this to try to solve the problem,the pcv was dirty but the engine dint smoke or run rough only pulliing out loss of power.The car now after doing a brim to to brim test is now 46mpg urban driving but no commutor traffic,as I have had to take ealy retirment on health grounds.The car now is now fantastic first time since my old sport car days,that ive got a car to put a smile on my face and be proud of.

Jules · 2nd March 2009, 00:33

Quote:

Originally Posted by jonned30

I have one of the bermuda triangle cdt's ( 2003 car registered 2008)It is automatic.
I drove it to Austria where I am currently working last October, It was fully laden and I got 45mpg at 80 ish mph all motorway miles ( about 650 ) .
It has egr replacement, Ron box set at 3,No2 air intake mod, K&N filter.
Since arriving in Austria the temp has been hovering around freezing point, I only travel about 10 miles to work and it never gets up to working temp before I arrive each day.
I have checked the mpg on 5 fill ups and each time I have got 29mpg, bit disapointing after 45mpg motorway driving but that's life I guess.

Those figures are very typical for an Auto and agree with the owners manual.

apywell · 2nd March 2009, 08:17

Quote:

Originally Posted by shakennstirred

try not running the fbh for so long and see what the mpg is them
my car has never been that low, even now in this cold weather im getting 36-37 mpg and highs of 44 when warmer, thats all on short runs no motorway driving

Does this mean that I can turn the FBH off? I thougnt it was automatic depending on the outside temp...

NikTheGeek · 2nd March 2009, 08:39

Quote:

Originally Posted by apywell

Does this mean that I can turn the FBH off? I thougnt it was automatic depending on the outside temp...

No, I was reffereing to my manual switch in an earlier thread and the fact that I turn it on most mornings. I'm a bit of a wuss if I'm honest and like a nice warm car! The suggestion was that I didn't run it so often...

As for the mileage, maybe mine is now correct. I've yet to take it on a long motorway run.

Nick

patrolman pete · 2nd March 2009, 08:48

wss:

Quote:

Originally Posted by Dragrad

Just put in a new thermostat and my mpg has gone up from a bismal 30mpg to 42mpg mixed driving.

Another thought...... do you have an FBH fitted?

I've noticed that too! I appear to be getting about an extra 100 miles out of a tankfull on a long holiday run and the engine seems a bit sweeter too (that bit might be all in my mind though!) But my temp gauge was running at just over 1/4 'til i changed the thermostat.

steve107 · 2nd March 2009, 09:07

mine diesel cdt tourer gets about 48mpg -55mpg no matter what the weather dont have fbh just put a coat on

JohnDotCom · 2nd March 2009, 09:08

Also please remember if an Auto on these cold days the gearbox will not go into top gear until up to temperature,
not noticeable on long runs but if doing less than 10 miles to get to work or jsut driving around Town areas, you will use more fuel.

Allegroboi · 2nd March 2009, 19:24

Quote:

Originally Posted by JohnDotCom

Also please remember if an Auto on these cold days the gearbox will not go into top gear until up to temperature,
not noticeable on long runs but if doing less than 10 miles to get to work or jsut driving around Town areas, you will use more fuel.

Never thought about that or noticed it to be honest. Good information John thanks

Ian

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1st March 2009, 19:06	#42
baggie9 Posted a thing or two Jaguar s Type Join Date: Feb 2009 Location: tipton Posts: 1,369 Thanks: 3 Thanked 1 Time in 1 Post	Hi Nick,I have only had my 75 since january 2nd.My mpg before fitting synergy2 ,new pb maf and pcv valve ,purchased of ebay same pcv as the freelander for £22.50P .Was in the low thirties and the car was dangerous puling out on busy junctions.THE

2nd March 2009, 09:07	#48
steve107 Loves to post 75 cdt tourer diesel Join Date: Jun 2008 Location: swinton rotherham Posts: 492 Thanks: 0 Thanked 0 Times in 0 Posts	mine diesel cdt tourer gets about 48mpg -55mpg no matter what the weather dont have fbh just put a coat on

2nd March 2009, 09:08	#49
JohnDotCom * Rover 75 FaceLift Tourer CDTi 170BHP Auto ConnSE 2005 Model Starlight Silver Join Date: Nov 2006 Location: Abergele Posts: 28,735 Thanks: 0 Thanked 6 Times in 5 Posts	Also please remember if an Auto on these cold days the gearbox will not go into top gear until up to temperature, not noticeable on long runs but if doing less than 10 miles to get to work or jsut driving around Town areas, you will use more fuel.