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Presumably the air fuel ratio displayed is from the O2 sensor. If you add hydrogen to the intake air, the O2 sensor read "rich" and pull fuel until it sees stoichiometric burn, which it will assume to be 14.7:1. You can add as much hydrogen as you want but you'll always see 14.7:1 as the O2 sensor is trying to get the ratio of oxygen to fuel correct, and the computer is assuming whatever that ratio is, to be 14.7:1.
You will of course be burning less gasoline and more hydrogen. Is hydrogen cheaper than gasoline per BTU in South Africa?
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