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I'd love for someone to try HHO on an Insight (and probably fail), but sadly there's no way I can make it to the Green Grand Prix. The Insight's engine is already around 40% thermodynamically efficient from the factory, which is better than many hydrocarbon power plants, and over a VERY wide rev and load range at that, suggesting the combustion chamber is very carefully designed to maximize gasoline combustion. I've read that adding ethanol negatively impacts this car more than most (though haven't experimented myself), probably because it's so carefully designed for pure gasoline. I would bet that trying to burn anything else would be suboptimal.
Why build an engine that would be better at burning something other than gasoline, when you're going to be putting gasoline in it? I could see some poorly designed engines benefiting from a small addition of hydrogen by accident...
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