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It looks like the 96% refers to the estimated fraction of the gasoline that is burned in the engine and exhaust system. I doubt that most of it burns in the catalytic converter but I agree that speeding up combustion so a higher percentage of the fuel burns in the engine will help improve engine efficiency. That is what hydrogen added to the fuel mixture is intended to do. I can't say how effective it is. I have seen an engine running without an exhaust manifold and it was blowing out flames from the exhaust ports. That shows that some of the fuel burns after it leaves the engine.
The whole title seems to imply that the post was intended for people who believe that an engine or a vehicle is 96% efficient. Most car engines have less than 30% efficiency even at their most efficient speed and load. Only a fraction of the heat generated from the fuel is turned into mechanical work. The rest is released, mainly from the radiator and the exhaust pipe.
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