Hi there, i have two Fiat Bravo 1.9 JTD 105 2000year.
I'm driving both and:
First one gives me 7l/100km in city traffic ||| 5/100 on the highway
Second one - 10.5l/100km in city ||| 6.1/100 on the highway

What i've done so far:
- timing belt, all filters - oil, air, fuel, pollen
- cleaned and measured MAF sensor:
measurements are:
850rpm - 2.2v
3000rpm - 3.5v
5000rpm - 4.1v
- checked all air pipes and changed the one at the TURBO entrance
- changed thermostat - dropped consumption with 1l from 11.5 to 10.5
- replaced catalyst with new one - just in case

Checked both cars with VISA Uniscan an there is only one error on the problem car - vehicle speed sensor - speedo is working just fine

Here is some data collected from the problem car:
Any advice would be helpfull.

the VSS signal is used for fuelling and timing / torque calculation on the road so its possible that it may cause the problem, although 10 l/100km does seem very high. but how are you calculating the consumption ? e.g. . by filling tank to the neck each time ?. it seems the VSS signal comes from the ABS unit, so maybe you would need to check the signal at the ECU pins using a scope to trace the problem. Another thing to try would be swapping over the MAF's.. also, what about coolant temps on the road ?

Well i live in a small city with small traffic. 7/100 from the first car is perfect.
Swapping MAF's - i tried it - no difference.

stylers - on the road the arrow stays in the middle, in the city - 2-3mm over the middle.
Thermostat is opening at 92 degrees and after it opens, goes down to 88degrees.
If this is what you mean by coolant temp.

I will attach a laptop later today to check for errors at the ABS diagnostic connector.

ok, but also what is the actual coolant temperature reported by the ECU in the diagnostics ? In case coolant sensor is dodgy. I think maybe you would want to check for the VSS signal at the engine ECU, using an oscilloscope or LED maybe, as this is reporting the loss of it. the signal would be a calculated in the ABS ecu using the average of the wheel speed sensors. Also, is the problem engine performing well ?. you could try comparing/logging the injection quantitys in the two cars on the road, see if there is a major difference there.