A pinch of salt to the soup... on our RJ100 mark II, digital pressurization allow us to climb to FL350, which we sometimes do. Our SOP have tables showing max weight (acc to OAT) for certain levels and 350 will only be reached if around (don't have the figures here right now) 38 or 39T. Routing say from GOT to ZRH will reward you with savings of approx 250 kg of fuel
On the other hand we do routinely climb to 310 with the "standard" RJ85/100 series. This mostly for fuel savings, but depending on the situation also to fly above wx or enjoy tailwinds
The more I fly it the more I like it
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... cut my wings and I'll die ...