I assume you are talking about the Focus mk2, correct ? Please confirm.

Ford updated the 1.6 TDCi engine for Euro V compliance and they changed the DPF to a coated-DPF (no fluid needed) so hopefully that's got rid of one of the problems. As for turbo failures etc. they did address the engine to allow better flow of oil around the engine. The other critical factor is to ensure the oil & oil filter are changed sooner than the 12500 miles or 1 year as per service minimum requirement.

We have a 1.6 TDCi Focus Titanium and it's a very much improved car compared with the pre-08 version, more refined, comfortable and easy to drive and plenty of useful equipment, the engine pulls from cleanly from low revs.

It varies depending on weather conditions, road terrain etc. but typically on a regular 100 mile run (including a tea & sandwich break) of which around 40 miles was dual carriageway and the rest was mostly A roads passing through a few urban villages and going via 3 towns I was regularly getting between 63mpg with head wind conditions and temp around 10c and around 74.5mpg during the summer months with temps between 19-24c. A typical mean would be around 72mpg during warmer weather. I haven't done those journeys during the winter months.

I used Shell FuelSave diesel and Shell V-power diesel, there was no difference in mpg between the two although the V-power produced a slightly smoother engine and made fresh engine oil dirty a lot quicker.

I use cruise control on duals and regularly on A roads, makes a long journey a lot easier on the legs.