Car has been sitting for 6 months, worth putting fresh fuel in?

[Harper 550]

My E46 M3 went out of commission around mid September to rebuild the motor. Took longer than I had hoped given covid and other hiccups along the way. Hoping to finish up with the motor some time next week which puts the car at about 6 months of sitting with the same fuel it was parked up with. Probably a mix of Gull Force10 and BP98 as I use either depending on wherever I am closest to.

Considering the motor going in is essentially completely refreshed (new rings, hone, bearings, refreshed head, cleaned and flow tested injectors etc) is it worth the time and money of discarding the 6 month old fuel and putting in fresh stuff? Tried to google what the shelf life of GF10 is but couldn't find anything concrete. 

[Eagle 1662]

How full was the tank?. 

[Matth5 471]

Small chance the ethanol might have drawn in some water, but I'm not sure that's a significant issue with 10% ethanol (likely less by the sounds of it). 

[KwS 2425]

Wouldnt hurt to drain the tank if you are worried about it

[Harper 550]

@KwS Yeah leaning this way