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I think you guys are only looking at hydrocarbons as the pollution/emissions. Hydrocarbons are easy, its NOx emissions that are tough to meet, do plenty of harm, and leaner is not better for them. There's no way you are eliminating catalysts and meeting modern vehicle emissions, I don't care what fuel prep is done.
Also, spark timing aids a great deal in lighting off a cold cat, not just running rich. Many cars will pull timing to well after tdc on startup to get still burning combustion gases into the exhaust. Cat light off can happen in seconds this way. Longer means much, much higher hydrocarbon emissions.
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