Other EfficientDynamics technologies applied include Auto Start Stop, Brake Energy Regeneration, Optimum Shift Indicator and on-demand operation of ancillary units.

ECO PRO mode gives the car the potential to cut fuel use by as much as 20%. In conjunction with the optional automatic transmission, the BMW 4 Series Coupe now also features a coasting mode for the first time. Another innovation is the Proactive Driving Assistant.

One additional gasoline and two diesel engines will be introduced later this year: the BMW 420i Coupe, BMW 430d Coupe and BMW 435d Coupe, plus two BMW xDrive options. The gasoline-fueled BMW 420i Coupe will develop 135 kW/184 hp and can be combined with BMW xDrive.

xDrive will also be available from the autumn for the BMW 420d Coupe. The BMW 430d Coupe will produce 190 kW/258 hp and maximum torque of 560 N·m (413 lb-ft). Topping the range will be the BMW 435d Coupe (exclusively available with xDrive), with maximum output reaching 230 kW/313 hp and peak torque of 630 N·m (465 lb-ft).

The current line-up of diesels features latest-generation, common rail direct injection, turbocharging and an all-aluminium construction to deliver high torque, smooth running and unsurpassed efficiency. In addition, the diesel engines come equipped with advanced BMW BluePerformance technology, combining a diesel particulate filter and oxidation catalytic converter with a NO_x storage catalyst to meet the future EU6 emissions standard.

A six-speed manual gearbox is standard, with an eight-speed Sports automatic gearbox, which allows the driver to change gear manually as well using shift paddles on the steering wheel, available as an option. The BMW xDrive intelligent, all-wheel-drive system can be ordered as an option from launch for the two gasoline-engine variants.

In conjunction with the optional automatic transmission, a coasting mode is now also available for the first time. In ECO PRO mode, this function decouples the powertrain as soon as the driver backs off the accelerator at speeds between 50 and 160 km/h (approx. 30 – 100 mph), allowing the car to glide along with no engine braking effect and burning minimal fuel. The BMW 4 Series Coupe offers a further innovation in the form of the Proactive Driving Assistant. Likewise in the interests of reducing fuel consumption, this function advises the driver of the ideal moment to ease off the accelerator when approaching corners and speed-restricted zones as well as towns and roundabouts.

Located just rearwards of the BMW 4 Series Coupe’s front wheels are Air Breathers designed to reduce drag around the wheel arches. The Air Breathers and Air Curtains underline the sporty character of the car’s design and provide evidence of the aerodynamics devised by BMW as part of its BMW EfficientDynamics development strategy.

The BMW 4 Series Coupe has a longer wheelbase, wider track and lower ride height than the previous-generation BMW 3 Series Coupe. Its lower suspension brings the car’s center of gravity down to below 20 inches (500 mm), giving it the lowest center of gravity of any car in the current BMW line-up. As a result, the new BMW 4 Series Coupe is inherently one of the sportiest series-produced cars in the BMW range.

BMW 420d Coupe. The diesel unit features latest-generation common rail direct injection technology, turbocharger with variable turbine geometry and precise solenoid valve injectors. The engine delivers maximum output of 135 kW/184 hp at 4,000 rpm and peak torque reaching 380 N·m (280 lb-ft) between 1,750 and 2,750 rpm. Acceleration from 0 to 100 km/h (62 mph) takes 7.5 seconds; the agile diesel can accelerate up to 240 km/h (149 mph).

Average fuel consumption is 4.7 – 4.8 liters per 100 kilometers (50 – 49 mpg US) and CO₂ emissions between 124 and 126 grams per kilometer (EU test cycle, depending on the tire format specified).

BMW 428i Coupe. BMW’s technology package for the 2.0-liter four-cylinder turbocharged engine includes High Precision Direct Injection, twin-scroll turbocharging, Double-Vanos variable camshaft control and Valvetronic fully variable valve control.

The engine generates maximum output of 180 kW/245 hp at 5,000 – 6,500 rpm and peak torque of 350 N·m (258 lb-ft), which the driver can access between 1,250 and 4,800 rpm.

Acceleration from 0 to 100 km/h (62 mph) is 5.9 seconds; the car has an electronically limited top speed of 250 km/h (155 mph).

Average fuel consumption of the BMW 428i Coupe in the EU test cycle stands at 6.6 – 6.7 liters per 100 kilometres (35.6 - 35.1 mpg US), with CO₂ emissions of 154 – 156 grams per kilometer. The optional eight-speed Sports automatic gearbox also opens up further potential for fuel savings in the BMW 428i Coupe: combined fuel consumption of between 6.3 and 6.4 liters per 100 kilometers (37.3 - 36.8 mpg US) and CO₂ emissions of 147 – 149 grams per 100 kilometers.

BMW 435i Coupe. Equipped with High Precision Direct Injection and Valvetronic fully variable valve control, the 3.0-liter engine with aluminum crankcase develops maximum output of 225 kW/306 hp between 5,800 and 6,000 rpm. Peak torque of 400 N·m (295 lb-ft) is generated as low down as 1,200 rpm and remains on tap up to 5,000 rpm.

Acceleration from 0 to 100 km/h (62 mph) is 5.4 seconds (4.9 seconds with xDrive) on the way to an electronically limited 250 km/h (155 mph) top speed. Average fuel consumption is between 7.9 and 8.1 liters per 100 kilometers (30 - 29 mpg US) and CO₂ emissions range from 185 to 189 grams per kilometer (EU test cycle, depending on the tire format specified).

When fitted with the optional eight-speed Sports automatic gearbox, combined fuel consumption is 7.3 – 7.4 liters per 100 kilometers (US), while CO₂ emissions are between 169 and 172 grams per kilometer.