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BMW 6 Series
The Top Gear car review:BMW 6 Series
Running costs and reliability
The 640i claims 37.2mpg and the 650i 32.1mpg, which actually isn’t too bad. But predictably the 640d manages a much better 52.3mpg while emitting 143g/km of CO2; not bad when you consider it’ll still hit 62mph in 5.3 seconds.