On my Rallye - I’d get 200-210 on a tour and 180 on a spirited ride..
If you spend your days doing 30 in 6th, yes. I get 210/215 out of my GSA and the refill is usually 26 litres which has me in the reserve.
So no, a standard GS won't do over 200 miles on a full tank. The GS I had before my GSA did 120-130 per tank which is half the reason I traded it after 3 weeks for a GSA.