So that's what the plastic funnel under the boot is for!
 

Just stumbled upon this video and now I know what the little white (unused) plastic funnel in a bag under my boot floor was meant for! I'd previously guessed it was maybe for topping up screenwash although it's not got much of of a funnel shape to it!

Mystery over! Odd that I've never needed to use this to fill up so why did they provide it I wonder?

https://www.youtube.com/watch?v=gg2mEfDarC0

For adding fuel additives to the tank, to push open the capless tank flap with.

It's in case you need to fill up from a petrol (diesel) can or syphon fuel from the tank.

For the first 3 years I thought it was some sort of centering tool for the spare wheel...................

Hmm, got to have a look in the boot of my 2012 V60 D4 that I've not long had now!

Martyn

My initial guess was that the funnel is for topping up the Adblue fluid tank on Euro 6 model cars? There should be a blue screw on cap somewhere?

It's so you can add fuel by the eggcup full without spilling any as drips will now cost you 25p each.