Message text written by Barry Schwartz
>(Severely) retarding the timing at idle provided
reduce emissions at the expense of engine efficiency.<
Barry, I beg to differ. Since the car is producing no output at idle (it
is merely turning itself over producing no work) the efficiency is zero
with or without vacuum retard.
At any rate, since the retard is shut off while the car is under way it has
no effect on MPG.
Dave
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