Poor fuel consumption

[Hamster31]

Hi,
I have a C30 1.6D from 2007 (the PSA unit), which is only giving me mid-forties mpg on a 'combined cycle', which is disappointing.

Does anyone have a similar experience? What should I expect, and what faults might contribute to poor consumption (I've already checked brakes, tyres and tracking). I've booked it in to have the following possibilities looked into:

1. The engine thinks it's cold when it's hot (rich running)
2. The air-con is actually ON, even when its set to OFF
3. The DPF is getting clogged

Can anyone think of anything else I should check?

Thanks everyone.

[iainmd]

The mpg completely depends on the type of driving you do and the way you drive the car. The majority of the time our V50 1.6D only goes a maximum of 7 or 8 miles each journey. As a result it averages 45mpg. On a long motorway drive with just me in the car I have achieved 59.1mpg at best. Fully loaded with a full boot, 4 people and a roofbox on a long journey it will struggle to get to 40mpg.

Ultimately, if most of your journeys are 5-10 miles or less then 45mpg would be expected.

[LizardOfBodom]

Originally Posted by Hamster31

Hi,
...
2. The air-con is actually ON, even when its set to OFF
...
Thanks everyone.

what do you mean by above? Your aircon switch have green led showing its active, when its not lit it means compressor is not working and you are just blowin air like a fan, not "producing" cold/warm air. Compressor sometimes can work on its own for 30seconds (apparently on every start) just to prevent seizing and lubricate itself but not sure if its for 1.6D aswell.

Not gonna comment on MPG issue (24MPG combined is an achievement for me :P) but 45 doesnt seem too off if city/traffic is included. Diesels wont excel with MPG unless its a steady highway drive, I think...

[Clan]

Originally Posted by Hamster31

Hi,
I have a C30 1.6D from 2007 (the PSA unit), which is only giving me mid-forties mpg on a 'combined cycle', which is disappointing.

Does anyone have a similar experience? What should I expect, and what faults might contribute to poor consumption (I've already checked brakes, tyres and tracking). I've booked it in to have the following possibilities looked into:

1. The engine thinks it's cold when it's hot (rich running)
2. The air-con is actually ON, even when its set to OFF
3. The DPF is getting clogged

Can anyone think of anything else I should check?

Thanks everyone.

Not disappointing , 30 mpg would be disappointing . Diesels always use more fuel in the cold months like right now . This was not one of the later -Driv e models which had a lot of work done to the whole car not just the engine make them more efficient , then they improved even further with the D2 version which has a 2 valve head and much higher boost pressure , these would do 70 mpg on the motorway as long as you didn't go over 65 mph ...

[Welton]

My experience of my own Common Rail Dizzlers:

2.0HDi (Peugeot):

38mpg Winter 43mpg Summer (over 3 years)

1.6HDi (Citroen):

43mpg all-year (over 5 years)

The most recent 1.6HDi does mostly town work so anything over 40mpg is quite good!

[x DTR x]

My V50 2.0l.D with 195k runs around 52-55 mpg in summer & 45-46 mpg in winter. Same regular 15 mile each way commute for work.