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Old 04-26-2012, 01:29 PM   #2 (permalink)
gone-ot walking...
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Today's ECUs, once in "closed-loop" operation, keep the engine at stoichiometric 14.7:1 A/F all the time, which is NOT what you (and aircraft pilots) do when you manually adjust the timing for "maximum best vacuum" or best fuel economy (which is quite 'lean' operation).
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