F21 owner here. My car's done over 86K now from new and I still achieve 31 mpg on average with the odd long drive keeping that figure up. Just pootling around on short trips will see it plummet to 24 or thereabouts. The N55 engine has been remarkably consistent and predictable all this time, despite enthusiastic driving from yours truly.
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Madgambler
325i (E30) => Alpina B3.33 (E46) => Alpina B3s (E46) => 130i M Sport (E87) => Cayman S (987c) => Carrera S (997) => M135i (F21)
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