[Pawel M]

Hi thanks for replay. I will check if I can see anything on a thermostats regarding temp. I bought them at eurocarparts where you give your reg and get correct parts. I will see if cleaning MAF will help with mpg. Regarding glow plugs and relay I'm waiting for swirl flaps blanks and will try to tackle that one too.
Is there any way to adjust thermostat?
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No, there thermoelements inside which open at set temperature. You would need to replace them to adjust the set temperature.

I looked up the partNr. of ther thermostats in the ETK.
11 71 7 787 870 AGR Thermostat
11 51 7 805 811 Engine Thermostat
For E90 320D M47N2 ECE
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and they are both replaced, which temp sensor shall I try? there is engine and coolant temp sensor I believe.