Bit delayed and not sure about gallons, but i'll take a guess.
I've done 4 brews so far this year on my new system, all are double batches (roughly 42L, which i'd say is 11g)
First, Belgium pale ale 11 gallons (993.5+11 = 1004.5)
Argentinan Pale Ale (homage to my planned trip there in 2026), 11 gallons (1015.5)
London Porter (getting closer to winter down in Aus), 11 gallons (1026.5)
Latest (drinking now), red ale, 11 gallons (1037.5)
So 1037.5 gallons.