Citroen C5 Issues

Hello all,
I have a Citroen C5 HDI Exclusive Auto 2003 Variant DC4HX Version DC4HXE and have two problems with it. (Will post each seperately)
The first concerns the fuel consumption and the MPG indicator.
The car has only done 27K and had mainly been kept for local mileage. Now its doing circa 80 miles per day.
It seems the fuel consumption is suspiciouly high. We get through a tank of diesel in 4-5 days (400). Dont know hoiw much the tank holds but this seems excessive?
The MPG indicator from the computer indicate 32.5 MPG - regardless of the speed I do! I have driven several miles at 30, 50, 60 and 70 miles per hour and the MPG sits at 32.5
Any idea on either of these two related )perhaps) issues?
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400 miles on a full tank doesn't sound unreasonable, unless the tank is a lot bigger than I expect. The C5 is not a small car!
If the fuel-consumption indicator is meant to show the varying rate for every minute or mile then it sounds as though yours isn't working correctly. I've never touched a C5 so I can't be certain of how it should work.
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they were saying:

32mpg does sound low, though it depends which engine it is. <quick google> Right, DC4HXE is 2.2HDi, which is considerably thirstier than the 2.0 or 1.6HDis - mix that with an autobox, and if it's only ever been pootled locally it's quite possible that the particulate filter's blocked and/or burning off - which requires more fuel. Any sign of an engine management light or "Pollution Fault" warning?

Normally (and, again, not C5-specific) there's two modes - instant and average-since-last-reset
It's entirely possible that it's in average-since-last-reset mode and it's not been reset for bloody ever - so the average won't exactly change rapidly. You wouldn't expect a couple of miles to change an average established over 27,000 miles...
As for the "Don't know how big the tank is"... SURELY it's not beyond the wit of mankind to actually read the flamin' pump...?
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[...]
... in fact you'd probably hope very heartily that it wouldn't!

Hmmm ... if it's flaming I don't think trying to read the numbers would be high on my list of priorities ;)) And with current prices, those numbers are just scary anyway.
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wrote:

32mpg sounds horribly low to me, my Mercedes w203 220 CDI (same size turbo-diesel and an auto box) returns 38 around town (9 mile trip each way) and 44+ on journeys. So the C5 at probably a lower weight, should be at least equalling these figures.
Richard (who's wife has a C2, hence the reason I monitor this NG). See http://www.caravanningnow.co.uk where my caravan's for sale.
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Thanks everybody - gives me something to think about.
As for reading the pump: £ per litre - MPG, Litre per gallon - head explodes. Only other option; read manual/instructions; am bloke; does not compute. fizz
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much like they were saying:

Clue: 4.5 litres in a gallon.
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Adrian wrote:

I always worked on 4.54; I used to have a little window sticker in one of my cars in the early 90s from Shell with a conversion chart on it.
I work out my MPG in my head when filling up. It's not that I'm smart, it's that I'm stubborn and I've been trying to get the hang of it for 16 years ;D
Richard
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