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The Reformed EGR (REGR) technique involves the injection of hydrocarbon fuel (e.g., diesel) into a catalytic reformer fitted into the engine EGR system, so that the produced hydrogen containing gas mixture is fed back to the engine as REGR. Thus, in effect the engine operates in a similar way to a dual fuelled engine with standard EGR. Depending on the reforming conditions, the composition and the calorific value of the REGR may vary and this affects the engine performance and emissions. In the present study, simulated REGR with different H2/CO ratios has been examined. The combustion of REGR with maximum H2 and minimum CO contents resulted in the highest reduction of NOx emissions. This case simulated the reformer operation where the CO is fully converted to H2 by promoting the exothermic water gas shift reaction (WGSR). The highest reductions of both smoke and fuel consumption were achieved in the case of simulating the reformer operation where the CO is not fully converted to H2.