David Massey wrote :
> 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.
Hmmm, what term would you apply to how much fuel it takes to keep the engine
turning ? My refrigerator doesn't produce any net work either (viewed from
outside), but we talk about it's efficiency ...
> At any rate, since the retard is shut off while the car is under
> way it has
> no effect on MPG.
Unless of course you have to stop for some reason <g>
Randall
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