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The paper contains results of both modelling and tests on the spark ignited (SI) engine modified to work as the engine with the overexpanded thermodynamic Miller cycle. Investigation was particularly focused on thermodynamic properties of the applied Miller cycle as well as combustion progress in the supercharged engine fuelled with various gaseous fuels as follows: coke gas, natural gas and hydrogen. Theoretical analysis provided essential information on optimal inlet valve closure and additionally it confirmed application of the Miller cycle to the gaseous reciprocating supercharged SI engine. Crucial conclusions deal with experimental investigation. The conclusions showed the following: resistance to knock increases with applying the Miller cycle, so does thermal indicated efficiency.