I have now done almost 7000 miles on a 2.0 TI SW, and have monitored every tank full, on a regular 54 mile trip mostly on duel carriage way and motorway. The best has been 37, and the worst has been 35mpg. So repeatably disappointing.
Being on duel carrageway I have used the cruse control as much as possible, keeping at 2250rpm in top.
So I have had discussion with the dealer. The suggestion being a peddle switches (accelerator,brake or clutch) which might give spurious signels canceling the DPF regerations if it is running.
An interested point was raised, to cancel the cruse control, you either brake, dump the clutch or switch of the cruse control (removing the speed memory). If this happens during the regen it is aborted. So I am now testing the idea that not using the cruse control may make a differance. I will see.
Reviewing all there are some interesting suggestions, which I will also try, 159bob idea of low temperature while the engine warms up. or air off is a thought, but not practical on a day to day basis. but it is worth it for a test while the weather allows it.
Other issue is the wheel geometery, which I had checked against spec and not one wheel was set correctly. So this has been looked at and see if this improves consumption and tyre wear.
Two thought though, the referance to driving like a nun / mother superior read this news artical about 3 nuns cought doing 120 mph through Rome in a Fiesta! The second a friend told me an Alfa is like an Italian girl friend, elegant, likes being noticed, has selective hearing (blue and me!) and requires lots of quality drink and many shoes!