How Many Miles To A Tank Full???? - Page 4

pondweed · 21st January 2007, 09:55

normal use, 2 long runs motorway and slow twisty A roads half loaded.
44.7mpg via brimming tank. inlet mod and synergy on 2.

pshuttle · 13th February 2007, 10:58

Right, there must be something up with my car as I am only getting about 400 miles to a tank brim to brim. Got a PSI Powerbox Digital Tuning Box (bought before RoverRon was making his TU3b) and a MAFAM with Pierburgh MAF. I also have a K&N Airfilter (which looks to be in perfect nick).

I do a 40 minute drive to work in the morning and then a 40 minute run back home in the evening. This is mostly country driving with about ten to fifteen minutes of town driving. Twice a week in the evenings I also do a thirty minute run on the motorway and about 10 mins of town driving.

I use Millers DPP and Shell diesel extra.

What would you recommend I check? EGR Valve? If so what do I need to do to clean this out, and should this make a difference to fuel economy?

Any help would be greatly appreciated.

Pete

PS I am going to disconnect the PSI box and also adjust the MAFAM a little to see if it makes a difference.

Ti Rich · 13th February 2007, 11:13

Quote:

Originally Posted by pshuttle

Right, there must be something up with my car as I am only getting about 400 miles to a tank brim to brim. Got a PSI Powerbox Digital Tuning Box (bought before RoverRon was making his TU3b) and a MAFAM with Pierburgh MAF. I also have a K&N Airfilter (which looks to be in perfect nick).

I do a 40 minute drive to work in the morning and then a 40 minute run back home in the evening. This is mostly country driving with about ten to fifteen minutes of town driving. Twice a week in the evenings I also do a thirty minute run on the motorway and about 10 mins of town driving.

I use Millers DPP and Shell diesel extra.

What would you recommend I check? EGR Valve? If so what do I need to do to clean this out, and should this make a difference to fuel economy?

Any help would be greatly appreciated.

Pete

PS I am going to disconnect the PSI box and also adjust the MAFAM a little to see if it makes a difference.

What speeds/distances are we talking about?

jaffo · 13th February 2007, 11:52

just for reference my 2.5 v6 gives 300 miles from full to the orange light illuminating!

Roverron · 13th February 2007, 12:36

The time of year has a lot to do with mpg on these cars.
You can expect 5-10% less, when used on frequent short journeys, due to the long warm up time.

No-one has found out so far, why some owners get worse than average mpg.

There may not be an engine related reason: it may be just down to time of year, driving style, traffic conditions, type/distance of journeys, gearbox type etc.

Ron

It's probably not beneficial to mpg to try and stay in a high gear and use very low revs, even if the engine will pull from 1000rpm.
Why not try keeping them above 1400rpm so that the turbo is producing some boost and the engine is operating more efficiently.

driverjgp · 13th February 2007, 13:44

Quote:

Originally Posted by jaffo

just for reference my 2.5 v6 gives 300 miles from full to the orange light illuminating!

Thats interesting, is yours an Auto? mine is an auto and from full to the orange light i get about 250 miles.

pshuttle · 13th February 2007, 13:57

The journey to work and back is roughly 40 miles.

Pete

Ti Rich · 13th February 2007, 14:12

Quote:

Originally Posted by pshuttle

The journey to work and back is roughly 40 miles.

Pete

Pete

A few things to try!

1) Tyre pressures - make sure they are correct.
2) EGR / PCV clean - it may help a little. See the how to guides on this website.
3) Oil - Use a good quality oil. I find a 0-40w gives a bit better MPG than the 10-40w specified.
4) Reduce the MAFAM a little - as you suggest. Are you getting any smoke?

One more thing - you do have the correct MAFAM for the Pierburg MAF?

OK, and another, where do you have the temperature sensor for the MAFAM?

JohnDotCom · 13th February 2007, 15:00

Quote:

Originally Posted by Ti Rich

Pete

A few things to try!

3) Oil - Use a good quality oil. I find a 0-40w gives a bit better MPG than the 10-40w specified.

Rich, thats strange in My facelift 2005 Manual it says Recommended use Mobil 1 0-40w Oil.

Ti Rich · 13th February 2007, 15:06

That's what I use John, Mobil 1 Diesel Oil 0-40w, but the manual in mine (last of the Mk1) say 10-40w - think!!!

13th February 2007, 10:58	#32
pshuttle Avid contributor BMW G20 320d. Previously, Rover 75 2.0 CDT Club SE and CDT Classic Join Date: Dec 2006 Location: Preston Posts: 203 Thanks: 0 Thanked 0 Times in 0 Posts	Right, there must be something up with my car as I am only getting about 400 miles to a tank brim to brim. Got a PSI Powerbox Digital Tuning Box (bought before RoverRon was making his TU3b) and a MAFAM with Pierburgh MAF. I also have a K&N Airfilter (which looks to be in perfect nick). I do a 40 minute drive to work in the morning and then a 40 minute run back home in the evening. This is mostly country driving with about ten to fifteen minutes of town driving. Twice a week in the evenings I also do a thirty minute run on the motorway and about 10 mins of town driving. I use Millers DPP and Shell diesel extra. What would you recommend I check? EGR Valve? If so what do I need to do to clean this out, and should this make a difference to fuel economy? Any help would be greatly appreciated. Pete PS I am going to disconnect the PSI box and also adjust the MAFAM a little to see if it makes a difference. __________________ pshuttle - Rover 75 2.0 CDT Club SE -----------------------------------------------------------

13th February 2007, 12:36	#35
Roverron Gets stuck in Rover Join Date: Nov 2006 Location: Tarbert Posts: 980 Thanks: 0 Thanked 19 Times in 9 Posts	The time of year has a lot to do with mpg on these cars. You can expect 5-10% less, when used on frequent short journeys, due to the long warm up time. No-one has found out so far, why some owners get worse than average mpg. There may not be an engine related reason: it may be just down to time of year, driving style, traffic conditions, type/distance of journeys, gearbox type etc. Ron It's probably not beneficial to mpg to try and stay in a high gear and use very low revs, even if the engine will pull from 1000rpm. Why not try keeping them above 1400rpm so that the turbo is producing some boost and the engine is operating more efficiently. __________________ [SIGPIC][/SIGPIC] Click to visit my website Ron on Twitter MyFacebook page

13th February 2007, 13:57	#37
pshuttle Avid contributor BMW G20 320d. Previously, Rover 75 2.0 CDT Club SE and CDT Classic Join Date: Dec 2006 Location: Preston Posts: 203 Thanks: 0 Thanked 0 Times in 0 Posts	The journey to work and back is roughly 40 miles. Pete __________________ pshuttle - Rover 75 2.0 CDT Club SE -----------------------------------------------------------

13th February 2007, 15:06	#40
Ti Rich Gets stuck in Audi A6 TDi 175 Join Date: Nov 2006 Location: Dudley Posts: 572 Thanks: 0 Thanked 3 Times in 2 Posts	That's what I use John, Mobil 1 Diesel Oil 0-40w, but the manual in mine (last of the Mk1) say 10-40w - think!!! __________________ CD(Ti Rich) Audi A6 C7 TDI - zzzzzzzzzzzzzz, so boring!! BMW 330d M-Sport - Gone and missed ZT CDTi, gone but not forgotten!

21st January 2007, 09:55	#31
pondweed This is my second home Waiter, Waiter! I seem to have a Roomster in my drive... Join Date: Nov 2006 Location: Sussex Posts: 3,268 Thanks: 0 Thanked 1 Time in 1 Post	normal use, 2 long runs motorway and slow twisty A roads half loaded. 44.7mpg via brimming tank. inlet mod and synergy on 2.

13th February 2007, 11:52	#34
jaffo Avid contributor freelander td4sport and mg tf 135 Join Date: Nov 2006 Location: midlands Posts: 202 Thanks: 0 Thanked 0 Times in 0 Posts	just for reference my 2.5 v6 gives 300 miles from full to the orange light illuminating!