The BMW TwinPower Turbo engine comes in three, four and six-cylinder versions, in both petrol and diesel options. They’re typified by exceptional power delivery and have been fine-tuned to minimise friction and reduce thermal loss, so increasing efficiency and decreasing emissions. In the BMW 1 Series, for example, the petrol-engined BMW 118i delivers 136hp with 54.3 - 58.9 mpg and CO₂ emissions of 112.0 - 122.0 g/km (with an automatic gearbox), while the diesel equivalent generates 116hp with 70.6 - 78.5 mpg. At the other end of the scale, the BMW M140i has a petrol engine that develops 340hp, yet will return up to 39.8mpg.
The BMW 3 Series Gran Turismo has a range of three petrol engines (184hp, 252hp, 326hp) and four diesel engines (150hp, 190hp, 258hp, 313hp), all of which provide a dynamic drive, yet return exceptional fuel and emissions figures. Figures for the combined cycle demonstrate this: 46.3 - 48.7 mpg, CO₂ emission 132.0 - 139.0 g/km for the petrol BMW 320i Gran Turismo, 62.8 - 65.7 mpg, CO₂ emission 112.0 - 119.0 g/km for the diesel BMW 318d Gran Turismo.
Step up to the BMW 5 Series Gran Turismo models and there’s a choice between two petrol and three diesel engines, offering between 184hp and and 450hp and fuel and emissions figures that start at 49.6 - 51.4 mpg and CO₂ emissions of 144.0 - 149.0 g/km.