Jaws
LIFE MEMBER
- Sep 26, 2008
- 23,829
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- Funster No
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- MH
- C class, Chieftain
- Exp
- since 2006 ( I think ! )
I have heard of this before but thought it was a load of cods wallop..
But now it has happened to me so I can no longer poopoo the issue but REALLY do not understand how the hell it can happen
I have got 28k on the van so whilst doing the service I decided it was time to change the diesel filter... Ever since then I am getting a good solid measurable 3 - 4 mpg
tried it twice with as accurate measurements as I can manage.. and got the same result twice ( had to do it twice cos I did not believe the first time )
Soooo
Given the filter JUST filters, how on earth can mpg improve when it is changed ?
I mean, it is before the pump etc and it can hardly change the rate of delivery of the pump nor change the amount an injector is opened
I simply do not understand this phenomenon
As a by the by.. When I first had the van it returned 19 to 21 mpg
I fitted a Torquing of cats black box and that improved it by 2mpg over the next few k miles I then had WOW! do an upload, was not happy and they kindly did a special for me which was magic, and I then averaged 25mpg regularly
Over the past two years the mpg has slowly dropped.. You know what its like.. Oh its the head wind, oh I had the hammer down a bit hard.. oh there is an R in the month.. you try and think of all sorts of reasons..
Well changing the filter has shoved the mpg right up to possibly even MORE than the 25mpg previously experienced ( But am reserving judgement until I have done a couple of thousand miles and can confirm )
But now it has happened to me so I can no longer poopoo the issue but REALLY do not understand how the hell it can happen
I have got 28k on the van so whilst doing the service I decided it was time to change the diesel filter... Ever since then I am getting a good solid measurable 3 - 4 mpg
tried it twice with as accurate measurements as I can manage.. and got the same result twice ( had to do it twice cos I did not believe the first time )
Soooo
Given the filter JUST filters, how on earth can mpg improve when it is changed ?
I mean, it is before the pump etc and it can hardly change the rate of delivery of the pump nor change the amount an injector is opened
I simply do not understand this phenomenon
As a by the by.. When I first had the van it returned 19 to 21 mpg
I fitted a Torquing of cats black box and that improved it by 2mpg over the next few k miles I then had WOW! do an upload, was not happy and they kindly did a special for me which was magic, and I then averaged 25mpg regularly
Over the past two years the mpg has slowly dropped.. You know what its like.. Oh its the head wind, oh I had the hammer down a bit hard.. oh there is an R in the month.. you try and think of all sorts of reasons..
Well changing the filter has shoved the mpg right up to possibly even MORE than the 25mpg previously experienced ( But am reserving judgement until I have done a couple of thousand miles and can confirm )