Take the BMW X2, for example. The xDrive25e plug-in hybrid we’re testing here emits just 40g/km of CO2 according to official tests, compared with 149g/km for the xDrive20d diesel. The difference ...

Badged as the BMW X2 xDrive25e, the newcomer goes head-to-head with the Mercedes GLA 250 e plug-in, with first deliveries expected in the summer. The X2 uses a 1.5-litre three-cylinder petrol ...