Poor MPG - Problem ? Options ? - Page 4

Finbo · Jan 23rd, 2009, 15:37

I've just bought a 54 plate (MY 2005) XC90 D5 geartronic.

On my way back from the garage (approx 140 miles - mostly motorway), the computer read 42mpg at journey's end with the cruise control set at 70mph and the tyres (Continentals) set at 39psi (the eco setting I understand from the forum). Obviously I was very happy with this.

The car was quiet and smoother (better than my previous P2 V70). But when I drove the 25 miles (mainly A + B roads) into work this morning I felt the tyre pressure wasn't helping the ride comfort. I could feel most of the lumps and bumps on our wonderfully manicured roads (!!!). BTW fuel consumption dropped to 39.5mpg - again a figure I'm more than happy with.

Therefore, I was wondering if you guys set the tyre pressures at a compromise level. The fuel flap says 32psi, unless fully loaded. Would something like 34 or even 36psi give a better quality of ride over the lumps and bumps??? Ride comfort is important to me, especially when driving home after a long day. I'm more than willing to lose a bit on the consumption, if it means a smoother ride.

Cheers,

Finbo

GSMGuy · Jan 26th, 2009, 09:43

Quote:

Originally Posted by RoyMacDonald

But doesn't it make you feel good to know it's nice and clean now? At some point it would have blocked completly as well.

The post above said his was 70% blocked and it did improve his mpg when he cleaned it.

All the best

Roy

I think, TBH Roy, that I am going to block mine off completely next time I change the oil etc, prob in a few weeks...

Mike

RoyMacDonald · Jan 26th, 2009, 16:20

Quote:

Originally Posted by GSMGuy

I think, TBH Roy, that I am going to block mine off completely next time I change the oil etc, prob in a few weeks...

Mike

What's your reasoning for that Mike?

All the best.

Roy

200bhp · Feb 6th, 2009, 15:16

Well it seems that in slow (my Wife's) driving it has only added 1.5mpg.

In fast driving is has added approx 5mpg.

Closing it would increase mpg.

I did ask a question in the engines section, which I then answered via Wiki about how EGR works.

RoyMacDonald · Feb 6th, 2009, 16:37

Quote:

Originally Posted by GSMGuy

I think, TBH Roy, that I am going to block mine off completely next time I change the oil etc, prob in a few weeks...

Mike

The Wiki page on the EGR thinks your car will fail it's emissions test if you do that Mike.

All the best.

Roy

Jan 23rd, 2009, 15:37	#31
Finbo Member Last Online: May 6th, 2024 13:02 Join Date: Dec 2007 Location: Somerset	I've just bought a 54 plate (MY 2005) XC90 D5 geartronic. On my way back from the garage (approx 140 miles - mostly motorway), the computer read 42mpg at journey's end with the cruise control set at 70mph and the tyres (Continentals) set at 39psi (the eco setting I understand from the forum). Obviously I was very happy with this. The car was quiet and smoother (better than my previous P2 V70). But when I drove the 25 miles (mainly A + B roads) into work this morning I felt the tyre pressure wasn't helping the ride comfort. I could feel most of the lumps and bumps on our wonderfully manicured roads (!!!). BTW fuel consumption dropped to 39.5mpg - again a figure I'm more than happy with. Therefore, I was wondering if you guys set the tyre pressures at a compromise level. The fuel flap says 32psi, unless fully loaded. Would something like 34 or even 36psi give a better quality of ride over the lumps and bumps??? Ride comfort is important to me, especially when driving home after a long day. I'm more than willing to lose a bit on the consumption, if it means a smoother ride. Cheers, Finbo

Feb 6th, 2009, 15:16	#34
200bhp XC90 03 D5 Auto Last Online: Feb 29th, 2012 07:27 Join Date: Nov 2008 Location: solihull	Well it seems that in slow (my Wife's) driving it has only added 1.5mpg. In fast driving is has added approx 5mpg. Closing it would increase mpg. I did ask a question in the engines section, which I then answered via Wiki about how EGR works.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)