Very poor mpg at 21.5 mpg - Page 6

Leighman · Jan 10th, 2013, 17:26

My C30 D5 Geartronic does 34 around town say 3-4 miles from a cold start, 50 at 50 (non-stop on cruise) and 42-43 on a fast motorway run. I don't take care to drive economically.

C30D5 · Jan 10th, 2013, 18:16

Quote:

Originally Posted by Leighman

My C30 D5 Geartronic does 34 around town say 3-4 miles from a cold start, 50 at 50 (non-stop on cruise) and 42-43 on a fast motorway run. I don't take care to drive economically.

Sounds like mine then.
I haven't yet had a very long run say over 150 miles in a trip but I'd hope to get high 40's!

subaqua · Jan 11th, 2013, 07:50

Quote:

Originally Posted by colinjy

tyre pressures ok ? it shouldn't drop it that much but if there quite low then you'll notice a drop

a 5 psi difference altered my mpg by 8mpg !! was astounded at that .

Zeb246 · Jan 22nd, 2013, 22:49

Success...Mpg went up without replacing anything.

IMG_0722 by Zuhayb Pics, on Flickr

GusGecko · Jan 22nd, 2013, 23:15

Sounds pretty good!

C30D5 · Jan 22nd, 2013, 23:17

What did you do to improve it?

Zeb246 · Jan 22nd, 2013, 23:32

Did F**K all to it, filled her up with Shell diesel 30 litres and cruised 80-90 mph. Did 200 miles today on the motorway, quite chuffed with the mpg made me put a smile on my face

I will change the fuel filter next month, and see what happens.

SonyVaio · Jan 23rd, 2013, 00:58

Was the car perhaps just doing regen cycles thus causing low MPG?

Zeb246 · Jan 23rd, 2013, 01:06

Quote:

Originally Posted by SonyVaio

Was the car perhaps just doing regen cycles thus causing low MPG?

I did reset the mpg before I headed towards the motorway, if that's what you mean? Don't quite understand the terms of regen cycles, would appreciate if you can explain further.

SonyVaio · Jan 23rd, 2013, 07:39

Your diesel I'm guessing has a DPF Filter (Diesel Particulate Filter)?

On a 2.0D it has an EOLYS fluid additive that is used to clean the DPF but your D5 does not, on the D5 when the cleaning process happens (regen cycle) you will notice a drastic drop in MPG, once regen is complete the MPG will return to normal.

You have to keep an eye on your oil level in the D5 as any unburnt fuel from a regen can make its way into the oil. Your car should have a sticker near the dipstick somewhere to say that the MAX oil level should only be 2/3 - 3/4 up the dipstick and not to the original Full Mark!

Jan 10th, 2013, 17:26	#51
Leighman Junior Member Last Online: Dec 12th, 2023 15:26 Join Date: Jan 2012 Location: Leigh-on-sea	My C30 D5 Geartronic does 34 around town say 3-4 miles from a cold start, 50 at 50 (non-stop on cruise) and 42-43 on a fast motorway run. I don't take care to drive economically. __________________ 2008 C30 D5 Geartronic

Jan 22nd, 2013, 23:15	#55
GusGecko from C30 to XC60 Last Online: Aug 28th, 2023 07:55 Join Date: Jul 2012 Location: Braintree, Essex	Sounds pretty good! __________________ XC60 D5 SE LUX NAV with toys 'n' stuff

Jan 22nd, 2013, 22:49	#54
Zeb246 Senior Member Last Online: Jun 9th, 2013 13:19 Join Date: Jul 2012 Location: Bristol	Success...Mpg went up without replacing anything. IMG_0722 by Zuhayb Pics, on Flickr

Jan 22nd, 2013, 23:17	#56
C30D5 Junior Member Last Online: Sep 21st, 2017 03:20 Join Date: Jan 2013 Location: Staffs	What did you do to improve it?

Jan 22nd, 2013, 23:32	#57
Zeb246 Senior Member Last Online: Jun 9th, 2013 13:19 Join Date: Jul 2012 Location: Bristol	Did F**K all to it, filled her up with Shell diesel 30 litres and cruised 80-90 mph. Did 200 miles today on the motorway, quite chuffed with the mpg made me put a smile on my face I will change the fuel filter next month, and see what happens.

Jan 23rd, 2013, 00:58	#58
SonyVaio VOC Member Last Online: Feb 26th, 2016 19:58 Join Date: Aug 2011 Location: Exmouth	Was the car perhaps just doing regen cycles thus causing low MPG?

Jan 23rd, 2013, 07:39	#60
SonyVaio VOC Member Last Online: Feb 26th, 2016 19:58 Join Date: Aug 2011 Location: Exmouth	Your diesel I'm guessing has a DPF Filter (Diesel Particulate Filter)? On a 2.0D it has an EOLYS fluid additive that is used to clean the DPF but your D5 does not, on the D5 when the cleaning process happens (regen cycle) you will notice a drastic drop in MPG, once regen is complete the MPG will return to normal. You have to keep an eye on your oil level in the D5 as any unburnt fuel from a regen can make its way into the oil. Your car should have a sticker near the dipstick somewhere to say that the MAX oil level should only be 2/3 - 3/4 up the dipstick and not to the original Full Mark!

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