BMW is extending the 1 Series line-up with a new model consisting of a brace of high performance, twin-turbocharged engines and a diesel capable of a frugal 58.9mpg. The new BMW 1 Series Coupé goes on sale in the UK next month and will be available in 120d, 123d and 135i guises.

The 135i marks the first time a twin-turbo petrol engine has powered a 1 Series, while the launch of the 123d heralds the introduction of the world's most powerful production four-cylinder diesel engine.

The flagship of the range is the BMW 135i with its 3.0-litre twin-turbocharged petrol power plant. Offering 306hp from its light alloy and magnesium straight-six engine, the 135i is capable of reaching 62m/ph in 5.3 seconds before going on to an electronically-limited top speed of 155m/ph. Peak torque of 400Nm from just 1,300rpm through to 5,000rpm ensures smooth, rapid progress and in-gear flexibility.

Courtesy of High Precision Direct Injection for the most efficient burn of fuel mix and Bi-VANOS variable valve technology, combined with lightweight engineering principles, the BMW 135i is capable of thrifty motoring while maintaining its top-end performance. The 2,979cc engine posts a 30.7mpg figure on the combined cycle and a CO2 emissions of 220g/km. BMW's EfficientDynamics programme seeks to boost engine performance while cutting fuel consumption and emissions. Second-generation, high precision direct injection and brake energy regeneration are both elements of EfficientDynamics deployed on the 135i Coupé.

The 204hp four-cylinder engine in the BMW 123d Coupé sets a benchmark for small diesels. Its 1,995cc power plant is the world's first all-aluminium diesel to have an output per litre figure in excess of 100hp - something only BMW M cars usually attain. It is also the first four-cylinder production diesel to come with twin-turbo technology.

Peak torque is 400Nm from 2,000rpm, while the engine revs to over 4,400rpm where peak power is attained. This performance equates to a 0-62mph time of seven seconds and a top speed of 148mph - previously unheard of figures in such small capacity production diesels. By comparison, the output of the four-cylinder BMW 123d betters that of established six-cylinder diesel engines from both Audi and Mercedes.

The BMW 123d Coupé also makes financial sense. Its 138g/km emissions figure sees it fall into the Band C Vehicle Excise Duty tier, while the fuel consumption figure on the combined cycle is 54.3mpg. It comes with auto start-stop technology, brake energy regeneration, third-generation common-rail fuel injection, a diesel particulate filter, active aerodynamics, electric power steering and low rolling resistance tyres.

For customers seeking an entry point into the new 1 Series Coupé range, the 120d offers another option of style, driving dynamics and parsimonious motoring. Its 1,995cc four-cylinder engine mixes a 177hp output and a 0-62mph time of 7.6 seconds with 58.9mpg economy and emissions of just 128g/km. All plus EfficientDynamics.

The new BMW 1 Series Coupé has 50:50 weight distribution and a front-engine, rear-wheel-drive configuration for the best in driving dynamics. To offer the most compliant yet sporting ride, and the best in directional stability, the 1 Series Coupé has a double-joint spring strut front axle arrangement with a five-link rear suspension. Such an arrangement allows engineers greater scope in finetuning the ride characteristics of the car.

The BMW 1 Series Coupé uses the same architecture as the three- and five-door models, but is shrouded in an elongated coupé body to emphasise the sporting nature of the car: it is 4,360mm long (133mm more than other 1 Series) and 1,934mm wide (1mm more). The slight increase in body size means the boot space swells from 350-litres to 370-litres.

The BMW 120d Coupé will be available in ES, SE and M Sport guises, while the 123d Coupé will be offered in SE and M Sport and the 135i Coupé just as an M Sport.

BMW is represented in Malta by Muscats Motors of Rue D'Argens, Gzira (www.bmw.com.mt).

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