Tale of the tyres

Michael has done 118,000km in his 318i, and in that time he has fitted four new tyres. But that doesn't mean he's done 118,000km on one set of tyres. His car has done 150,000km, which could mean each of the two sets of tyres fitted to it in that time might have covered 75,000km each. To get 118,000km out of a set of tyres on a 318i would be no mean feat.