Same here. I don’t really hold back too much and I’m seeing an impressive 32mpg average. From experience with the same style of driving in previous hot hatches I only expected mid 20’s at best.
Mine shows about 315 after a fill to the brim (super unleaded I should add…. Without starting the debate again 😬). Like all new cars, it’s typical modern “smaller” tank, I’m always amazed with how much diesel I can get in to my partners 2010 Astra, that fuel tank feels relatively massive nowadays.