38mpg at 70mph. 2004 C5 estate 110bhp

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torq
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38mpg at 70mph. 2004 C5 estate 110bhp

Post by torq »

Hi Guys,
it's all in the title. Good or bad? I'm hoping for bad, easily fixed and at least another 12mpg. The figures come from fill, drive and refill. No fancy computers here just maths. Nearly all my driving is motorway and I need better mpg than that or it's bye bye citroen, bye bye seat alhambra and back into a bmw 320d touring,
Thanks.
Torq


P.S. I'll be doing the usual. Can of diesel purge into the fuel filter, check brakes aren't binding, new air filter, clean egr valve, tyre pressures etc
Last edited by torq on 23 Sep 2011, 22:51, edited 1 time in total.
BX
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Post by BX »

Was this mileage from one fill or over several. The 2l hdi normally gives me 11miles per litre when checked over several fills. Even when filling at the same pump it is hard to fill up consistently but the more fills the smaller the error. Im not sure how it reacts to 120KM/hr (+VAT) on the motorway. Such trips usually involve a lot of Dublin driving as well.
torq
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Post by torq »

Just one fill, only have the car 2 weeks.

I swear I can see the fuel gauge dropping as I drive! I travel 2mins to the motorway and 2 mins off at the other end with 20miles inbetween.
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Post by HDI »

Any other symptoms like black smoke from the exhaust ?
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torq
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Post by torq »

No smoke and driving well. I'm hoping that there is a small fuel leak somewhere as the previous owner had the head skimmed not long before he sold her.
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Post by Peter.N. »

I have that engine in a 406 estate and it returns just over 60 mpg at a steady 60 mph on the motorway. At a steady 70 I would imagine it ought to return 55 mpg unless you are driving it like a petrol engine.

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Post by SaabC5 »

Agreed its definitely on the low side, my 2.2HDi returns late 40's at the NSL and a friend who purchased a 2.0HDi estate because he liked mine so much reports about 52-55mpg on a run.
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Post by myglaren »

The best I have managed was 50.3 on a 630 mile round trip, mostly motorway miles but a bit of running around in Bedford & MK.
Speeds somewhat higher than the NSL where road conditions permitted.

Grand average is 36mpg but this is predominantly very short trips and lead boots.
torq
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Post by torq »

Did a proper test today. A 171 mile at 70mph or slightly under, round trip to ikea with a full tank and filled up when i got home. 17litres. Which works out at 45.9mpg, much better than i thought but still not good enough.

But i think have a bit of good news. Had a look under the front of the car and it looked wet. I hoped it was a diesel leak but it turned out to be a red fluid. Could this be the source of the dropping rear end? We'll see!
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Post by myglaren »

Yep, LDS is orange.
Have you checked the reservoir? May be very bad news if it starts to scavenge for fluid.
Under the front of the car I would check the power steering/pump/hoses/rack.
The hoses are prone to leakage with age.

Miss-read the first part of your post and thought you must be from this general area as the A171 is close by. Not what you actually said though, on re-reading :(
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Post by cachaciero »

torq wrote:Did a proper test today. A 171 mile at 70mph or slightly under, round trip to ikea with a full tank and filled up when i got home. 17litres. Which works out at 45.9mpg, much better than i thought but still not good enough.

But i think have a bit of good news. Had a look under the front of the car and it looked wet. I hoped it was a diesel leak but it turned out to be a red fluid. Could this be the source of the dropping rear end? We'll see!
Being doing some research on fuel consumption on various diesels and there appears to have been a seismic shift round about 2007 doesn't matter if you talk Citroen or BMW / Merc they all seem to have been able to do something to get their carbon levels down a couple of tax brackets, I wonder what was done and is it retrofittable :-)

If you have a coroded or otherwise leaking hydraulic line to the rear suspension that would explain both the drooping rear and the oil underneath.

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Post by Citroenmad »

The 2.0HDi 110 should do more than that on a steady run at 70. You should see much closer to 50mpg on the 110 from that kind of driving.

However, is your MPG calculated or from the trip computer?

I know when I check our 110 C5 its around 4-5MPG down on the actual MPG. So if ours is recording 45MPG then its really much closer to 50. Ive had the car getting on three years now and its always been the case, the car runs fantastically though and is great on fuel.

My late 2.0HDi 138 16v has a trip computer MPG which is as near as makes no difference spot on to the actual MPG. However the three 2.0 110s we have had have all been quite out on the trip compared to actual.
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torq
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Post by torq »

She's a poverty spec LX so no trip computer or cruise control. All mpg figures are calculated by fill, drive and fill. I'm know a bit about common rail engines after owning a couple of ducatos and a relay so I'll just have to work through the fuel system till I find the fault. No black smoke though which suggests it's a minor fault and possibly not fuel related, maybe binding brakes.
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Post by andy5 »

cachaciero wrote: Being doing some research on fuel consumption on various diesels and there appears to have been a seismic shift round about 2007 doesn't matter if you talk Citroën or BMW / Merc they all seem to have been able to do something to get their carbon levels down a couple of tax brackets, I wonder what was done and is it retrofittable :-)
The more I look at figures for some cars, the more I think the manufacturers might almost make them up for their own convenience - not only are there are so many cars with CO2 figures ending in 9, like 99, 119, 129, but also a lot of cars have recently improved consumption by 10 or 15% without losing weight or any explanation of improvements to the fuel system or significant aerodynamic mods.

There's one car which has improved from 56 to 74 mpg combined figure in 3 years. There have been some aero mods, but when they also add a stop start system I don't see how can that improve the extra-urban figures from 74 to 83 mpg. In real life, on a German site where people publish their own figures, only 3 people out of over 100 have bettered 65 mpg overall, only a dozen above 55 mpg, and the median is about 50.
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Post by Gibbo2286 »

I'm finding the C5 2.0 HDI hatch is much poorer on MPG than the Xantiia 2.0 HDI hatch so far, my fuel consumption on the Xantia over the whole 18 months I owned it averaged out at 41.56 MPG, the C5 is so far only averaging 32.9 MPG

I keep a log of all my fuel use and mileage, a habit formed while running a business.

Most of the travel is local semi rural with the occasional mixed 80 mile round trip.

Both cars ran clean and sweet and the emissions readings are as specified, maybe too much use of the air-con and I'm told there's extra weight in the C5 but I haven't checked.
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