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Cylinder deactivation has become common not only in large swept volume gasoline V-engines but also in cheaper highly downsized automotive engines. Cylinder deactivation strategy leads to a combination of reduced throttling and pumping losses and consequently, to CO2 emissions reduction. This is achieved by deactivation of some cylinders and by moving the operation point of the firing cylinders to higher loads to compensate for the deactivated cylinders. This paper focuses on the 1.4 litre direct injection gasoline 4-cylinder (inline) engine and the development of its deactivation strategy in the Model in the Loop (MiL) environment using the Ricardo 1-D gas real-time code ‘WAVE-RT’ as the virtual engine controlled by the engine control strategy. The engine control strategy can be easily flashed into rapid prototyping ECU and validated on the testbed.