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The Top Gear car review: BMW M135i
Running costs and reliability
All the work BMW’s put into making the new 3.0-litre turbo engine efficient pays off. This averages 35.3mpg and the eight-speed auto is even better, averaging 37.7mpg (with less CO2 too). Impressively, it’s not only greener than the old 1M, it’s also £10k cheaper. With retained values likely to be higher than if it were a plain old BMW 135i, we reckon this could be the performance hatch bargain of the year, particularly now the facelift’s made it so much prettier. Clincher? It’s only marginally dearer than its arch-rival, the Audi S3.