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The hydrogen hydroxyl (HHO) gas as a fuel additive in gasoline for SI engines has a positive impact on improving the performance and reducing the consequences of the burning of fossil fuels alone which are continuously depleting and causing severe problems to the environment. In this paper, the effect of injecting HHO gas additive in the gasoline fuel of a petrol engine was experimentally explored in detail to improve the overall efficiency in terms of performance indicators such as engine fuel consumption, brake horsepower and engine’s torque developed. The engine was coupled with an electric generator to be used for the production of electricity at a relatively low cost. An experimental setup was established to measure the performance indicators and it consists of an HHO gas generator integrated with solar panels, a gasoline engine coupled with an electricity generator, a storage battery, and relevant measuring instruments. The HHO gas was produced and injected into the intake manifold of the engine whilst it was running at different load conditions. The main parameters such as engine RPM, output voltage/amperes of the electric generator were measured and performance indicators were calculated to determine the overall efficiency of the system.  From the results, it was shown that the HHO additive had increased performance of the petrol engine performance at a lower HHO-fuel ratio while the engine is running at lean fuel conditions.