2006 330d power and economy issues
Would a faulty thermostat affect the performance as well as economy?
My engine temp doesn't get much above 75c. On the last tank I drove as economically as I could and got 466 miles from 57 litres (37mpg).
I've also had performance issues recently but they seem a little intermittent.
I'm after any ideas on this as its bugging me.
No fault codes are logged.
Thanks in advance