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Citing one study that didn't pan out is unimpressive. The fact is that the whole concept of the catalytic converter evolved from a platinum additive test which was effective - just too expensive.
There is a reason why diesel engines get so much better mileage than gasoline/ignition engines.
Every vehicle sold to consumers is a compromise between performance, emissions production, safety, efficiency, economy, longevity, functionality, and profitibility. If we want to improve our efficiency only, we can easily do that at the expense of one or more of the other factors of compromise. To say that we can't is ignorant. To reference physics without understanding it is foolish.
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