Having fixed the alternator AND changed the oil 2 weeks ago my computer MPG has been steadily climbing despite refilling & resetting the computer last week.
I was doing well to get 39 on the computer before the oil change but it has now crept it's way up to 43.
What's going on? The car still runs the same, it's no faster.
How much difference does new oil & filter make?
If lots then which oil gives best MPG?
Which filter gives the best MPG?
Is it the new oil or the new filter?
Hdi MPG variations
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Hdi MPG variations
2003 estate Hdi90 Siemens Fully pimped (roofrack&towbar)
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Re: Hdi MPG variations
I don't think it's related to your oil and filter change, probably just coincidence.
I'm currently getting unusually good mpg, (for me) - the last two tankfuls have returned 45.6 & 44.8 respectively accoring to the trip computer and my brim-to-brim cross check last night gave 63.89l / 639 miles or 45.4 mpg. I think it's down to a combination of weather, traffic conditions and me being a morsel more patient.
I'm currently getting unusually good mpg, (for me) - the last two tankfuls have returned 45.6 & 44.8 respectively accoring to the trip computer and my brim-to-brim cross check last night gave 63.89l / 639 miles or 45.4 mpg. I think it's down to a combination of weather, traffic conditions and me being a morsel more patient.

2002 HDi 2.2 Exec Estate, (2008-12) (wonderful)
2003 HDi 2.2 6-speed Exec Estate (2012-19) (also a gem)
2009 Citroen C5 2.0 HDi VTR+ Estate (godawful heap)
2008 BMW E91 330i touring (great fun - murdered by a reversing SUV)
2007 BMW E91 325i touring (slower smoother quieter)
2003 HDi 2.2 6-speed Exec Estate (2012-19) (also a gem)
2009 Citroen C5 2.0 HDi VTR+ Estate (godawful heap)
2008 BMW E91 330i touring (great fun - murdered by a reversing SUV)
2007 BMW E91 325i touring (slower smoother quieter)
Re: Hdi MPG variations
when i changed my oil and air filter my mpg improved a lot,mind u the air filter was in a bad way,i use fully synfetic oil m8.i had only had the car 2 weeks so dont know how long it had not been done for.
Re: Hdi MPG variations
I've got a 2.2 and getting around 40mpg on the trip and 37mog genuine.
Towing I managed 35MPG, but was cruising at 55mph.
Towing I managed 35MPG, but was cruising at 55mph.