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 up to 61.4mpg depending on gearbox and trim, and therefore wheel size and weight. CO2 emissions are 120g/km.

The 118d doesn’t lag too far behind, with CO2 emissions of 122g/km and economy of up 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 57.6mpg; CO2 emissions are 129g/km.

Petrol models also fare well; the 118i returns a respectable 49.6mpg depending on spec, with CO2 emissions of 130g/km, while the hot M135i is remarkably frugal, with a maximum 38.2mpg and CO2 emissions from 168g/km. The 128ti can muster 40.9mpg with a worst case emissions scenario of 170g/km of CO2.

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Insurance groups

The BMW 1 Series occupies insurance groups 21 to 36, with the 116d and M135i bookending this range. 

Depreciation

Our experts expect that the BMW 1 Series will hold on to around 54 per cent of its value after three years and 36,000 miles come trade-in time, which is pretty much on a par with the Mercedes A Class.