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https://www.bicyclerollingresistance.com/specials/grand-prix-5000-comparison
https://www.bicyclerollingresistance.com/specials/conti-gp4000s-ii-23-25-28gp5000 28 is 1.5mm wider than gp4000s 25 with the same rim and pressure in the above links
svenhöek
dglshrn
It is an older one, I've just heard so many times that 4000s size up massive (as big as 28 in some cases). I'd like to ride the biggest tyres I can, and honestly don't expect to fit 28s, but was just curious...