This reminder, from a credible source:
Quote:
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In fact, any modern engine in good condition and at normal operating temperature emits only about 1 - 2% of the input fuel as unburnt hydrocarbons, even before passing through the catalyst. I have studied test data for literally hundreds of engines over the past 10 years and this is absolutely consistant for all engine types. Only engines that are very old (say more than 50 years) or in serious need of maintenance/adjustment would waste anything like 15 - 20% of their fuel
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Fuel saving gadgets - a professional engineer's view
(I post this in response to the comment earlier in this thread that a significant amount of fuel is burned in the cat.)