BMW 1 Series review - MPG, CO2 and Running Costs

One of the benefits of the 1 Series’ all-new platform is its ability to accept a range of frugal engines. The light weight and a range of turbocharged three and four-cylinder engines mean emissions are low and economy is strong.

The most efficient model in the range is the 116d, whose three-cylinder diesel returns 54.3 to 62.8mpg depending on gearbox and trim, and therefore wheel size and weight. CO2 emissions are 100g/km – a remarkable feat in a car of this type.

The 118d doesn’t lag too far behind, with CO2 emissions of 108–109g/km and economy of 51.4 to 60.1mpg. Given the minimal difference in economy over the 116d but significant increase in performance, it’s likely to be the best choice for diesel buyers. Opt for the more powerful 120d and economy drops to 48.70–53.3mpg; CO2 emissions are 117g/km.

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Petrol models fare well; the 118i returns a respectable 40.9–47.1mpg depending on spec, with CO2 emissions of 114–121g/km. The hot M135i is remarkably frugal, with 34.4–35.8mpg and CO2 emissions sitting at 155g/km.

Insurance groups

The BMW 1 Series occupies insurance groups 21 to 39, with the 116d and M135i bookending this range. By comparison the Mercedes A Class, which sits in groups 17 to 37, could be cheaper to insure at either end of the spectrum, with these figures relating to the A180 d and Mercedes-AMG A35 respectively.

Depreciation

Our experts expect that the BMW 1 Series will hold on to around 44 to 52 per cent of its value after 36,000 miles and three years come trade-in time. This compares well against the Mercedes A Class, whose value after the same period will be 46 to 52 per cent.