Maximum torque of 300 N·m is available at 1,750–2,500 rpm. The new multiple injection system at 1,600 bar improves the combustion process and reduces consumption. To reduce friction in the engine, the camshaft is supported by needle bearings. Cylinder pressure sensors in the glow plugs (Cleantech Combustion Technology) enable very accurate combustion control. A variable displacement oil pump delivers only the necessary oil pressure. This is controlled by the engine control module and helps to reduce the CO₂ emissions.

To ensure optimum electrical energy management, Opel introduces a braking energy recuperation system which recovers kinetic energy via the generator in engine overrun mode, converting this to electrical energy and feeding it into the battery.

This happens automatically when the driver takes his/her foot off the accelerator pedal or presses the brake pedal. When the battery is sufficiently charged, the generator output is greatly reduced and the electrical energy consumers are powered in a fuel-saving manner by the buffered electrical energy. This relieves the engine from having to drive the generator when accelerating and thus reduces consumption and emissions. In addition—like in all Zafira Tourer models—a clutch only activates the air conditioning compressor when it is actually needed.

The Start/Stop system developed by Opel will be available more than 30 vehicle-engine combinations by the spring of 2012. With Start/Stop, the engine stops automatically as soon as the driver shifts into neutral, releases the clutch and the rpm needle moves to the special Autostop position. The driver then just shifts into first gear to drive off again. A battery ensures reliability of the electrical system and immediate engine start-up. For reasons of safety and passenger comfort, temperature controls and the brake booster vacuum control remain active during the Autostop phase. When deemed necessary, for instance in slow-moving stop-and-go traffic, the driver can manually deactivate the system with the “eco” switch.

A range of other measures also plays a large role in the new Zafira Tourer 2.0 CDTI ecoFLEX’s reduced consumption. For improved aerodynamics, the body is 10 mm lower and an active aeroshutter is integrated in the radiator grille. While it remains open to maintain optimal temperature at low speeds and when the engine is running under high thermal load such as on inclines and when in towing mode, the aeroshutter automatically closes at higher speeds and directs driving wind around the car.

This results in improved aerodynamics, lower fuel consumption and lower CO₂ emissions. The Zafira Tourer 2.0 CDTI ecoFLEX has 225/50 R17 low-rolling-resistance tires. The shift indicator—an illuminated gauge located between the speedometer and revolution counter—signals the driver the ideal moment to shift up and helps to adapt to a fuel-saving driving style.