Radiator Fan & Fuel Consumption

2012 20Tdi 177bhp, with full Audi service history.

Couple of questions

I had the Q5 few months and I've noticed that the radiator fans can run for up to 5 minutes after the engine has stopped. Is this normal?

The fuel consumption is not great low 30's mpg. I've been told this is due the fix carried out due to the diesel scandal few years ago, is this right, If so can the fix be undone?
Or
Should I be looking at something else?

Thanks

Allen

It sounds like it is going into regeneration mode a lot, have the soot and ash mass figures read and it may need a DPF clean.