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Sorry if this question has been asked previously......I had a look but couldnt find anything
Looking for some advice from you mechanically minded heads out there
I have a 2003 Fiat Ducato (2.3jtd) coach built. It has 45,000 km on the clock and running well.
We were out on the van for the weekend and I have calculated that I was getting 20mpg (14L/100km in new money). The majority of the driving was motorway and we were not pushing any harder than about 100kph
First question is.......does this sound very heavy on juice or is it standard for the 2.3?
Just one thing that might be of note, If the van is running, and you are standing outside, you can hear a "hissing" noise from the engine bay. When we bought the van, we had it checked by our mechanic and he heard the noise......he initially though that it was a turbo issue but having connected the van to diagnostics, no errors showed up for the turbo. The mechanic then put the "hissing" noise down to a leaving vac/air line and indicated that there was no concern
Given the heavy fuel consumption, I am wondering if there might be a problem with the fuel air mix causing excessive fuel burn? (kinda like your central heating oil burner)
Perhaps 20mpg is a s good as it gets
The van has not been remapped and as I understand it, remapping doesn't really effect your fuel consumption rather it gives higher end torque?
Just the first one to reply, as you can see my MPG figures are the same but I would expect it for a large motorhome.. for your van I would expect around 28 to 30mpg so just wait for others to reply who do own your model and compare.... my view is there's something wrong as you mentioned you are on the correct lines. Clive
We just done 2350 miles the long way down to the Algarve on a 2008 2.3 Fiat Ducato based Sundance, fully loaded. Average speed 47MPH, fuel was 27.2 MPG. That was a mixture of all types of roads. Not sure if this helps?
Our 1997 Fiat based 2.5Td Hymer returns a steady 28.4mpg at around 50-55mph so I would guess there is something not quite right with yours
______________________________________________________________ Quisque competit mea sententiam
(I typed this but canīt remember what it means - thatīll teach me to be a Smarta*se)
I have been tracking my 2.3 since getting it last December, the figures are at the bottom of this post. If you click the figures it should take you into the logbook feature.
many thanks for all the info folks........i really must get to the bottom of this hissing noise
Now the next question is where to start looking........it seems more audible when standing at either driver or passenger door and in front of the van....somewhere near back of engine block perhaps?
Anyone with a new(ish) 2.3 JTD should go on to the outandaboutlive forum (motorhome matters) where the same question has been asked.
Look at the reply from euroserv. You will get less mpg and the reason is quite distressing. Owners of older m/homes are going to be much better off regarding mpg.
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Luckily things level themselves out 
