[prumpfy]

The only comment I would make is that the thermostat is critical. In my posts on the LS focus in this forum, I found the thermostat was opening at about 40 degrees C. I replaced the whole assembly with a new part.
The new thermo opened at about 85 deg C. This fixed the problem, but short runs in a cold climate destroys any sensible Fuel consumption figures.
Recently, I have become worried that the thermo is opening at lower temperatures, AGAIN! It is taking about 10Km of driving to reach its stable operating temperature. Should be about 5 to 6 Km.
I will check it again; it is a pain to get to the thermo. If it is faulty, I will replace only the thermostat; not the whole assembly.
The car is due to go for service soon. I will get the air inlet hose checked as well. The car over-revs at startup and this is often caused by a split air inlet hose.
See my posts on this subject.