Most of the games I play are CPU heavy incidentally, eu4 etc. I will say the biggest difference is the computer does not get very hot and the fans only spool up to 2500 rpm or so (out of their max of 6000rpm), but eu4 on full tilt will still drain the battery like it has a leak in about 2 hours or so. It isn't a very intensive game but it is one that has a speed setting where the max setting is basically "as fast as the cpu can compute." It does run noticeably faster at the max speed setting on this cpu (single core game, as expected going from 2.5ghz to 4.05ghz per core) but I don't think the battery life differences are significant. Especially considering the health of this battery compared to my 2012 intel computer (which I eventually replaced the battery for).

Outside of that the computer is good for probably 6 or 8 hours of my usual use case (ssh to remote server, a couple browser tabs, mac mail client open). I think the screen is a big power suck and I tend to find that autobrightness is putting it on max brightness setting even in an indoor room (like right now in fact). When I replaced the battery on the intel mac I was good for about 5 hours but I had to put the screen brightness on a minimal setting.