Citroen Berlingo 1.9D poor economy

[Davethesinger]

Hi Guys, New here so hello to all!:wave:
I've got a Citroen Berlingo MS 1.9D on an 04 plate.
Fuel economy is poor at around 30mpg even with conservative driving.
I suspect someone played around with settings and screws on the fuel system before I bought her.:brickwall:
Can anyone guide me through re-setting thins that might improve the economy please?cratch:

[chronyx]

How many miles do you get to a tank Dave?

I got 400 to my last fill up of £65!

[divingscubaboy]

They're not as economical as you might think unless literally plodding everywhere. Trouble is the temptation to rag the hell out of them to try and eke a bit more is so pointless, i've tried!

[chronyx]

I haven't been ragging it, apart from winding her up to 90mph after a long downhill for a few miles just to see what she can do! But I don't rev it hard. It's my van - I'll be the mug paying for it.

How many miles do you get to a tank scubaboy?

[divingscubaboy]

My wife drives it during the week. She dosent hang about but its 2 shortish trips everyday, gets worked harder at the weekends with a mix of country roads and dual carriageways. Normally around 500 miles when the light comes on.

[rudy]

mine does ab 140 miles to £20 but its a pig to start from cold !!

[chronyx]

Do you think 400 miles to a tank warrants further investigation?

[divingscubaboy]

Sounds a bit low to me! What is your warm engine idle speed? Any smoke? Is the air filter clean? Might be worth a dosing of redex or similar. What mileage has it done?

[chronyx]

That's the thing, it only smokes visibly in the mirror if I floor it, which I rarely do.

It's done 103,000 miles.

I don't know the idle of the top of my head, but it sounds OK ticking over!

Wondering if the timing has been knocked out slightly with a cambelt change as a 306 HDi I owned had a drop in economy after a cambelt change.

[divingscubaboy]

Its a possibility as the pump and cam sprockets are 'tweaked' slightly when changing the cambelt on this engine. But I would expect it to be noticeably a bit of dog at the top or bottom end and its not is it?