This may have been mentioned before ....

I needed to fill up with fuel today before a run out ( down to 8% ), during the fill I decided to experiment.

At that level of fuel I knew from experience I would get about £25 worth in and fill to somewhere in the 90% on first click. No second clicks here ......
I decided to stop filling every now again to give the balance pipe a chance to fill the left hand tank.
I have no idea how long the tanks take to equalise , but I set an arbitrary 5 seconds fill pause for every £5 I put in.
To my amazement it went up to £30 before the first click , and filled to 100% , which I have never seen in 7 years of ownership !

I will be trying this again on next fill , but if anyone else wants to give it a go , please report back !