I'm currently getting just over 50mpg on this tank. I'd done 220 miles with the dial showing half. I know this ain't too accurate so I filled up earlier for £22, so it was near enough half. Approx £10 per 100 miles - happy days!
That half tank included an 80 miles motorway trip (with about 16 miles of stop start) and just B road driving, some of which spirited. I'm pleased with, especially coming from a 330ci where 30mpg was achievable if you tickled the go pedal!
It's always entertaining watching the trip computer and the mpg showing 150 or something.