> It gives you
> marginally better fuel mileage at part throttle. Does that
> matter in a Spitfire? Well, of course, but not so much as
> for a heavier car with a bigger engine.
Even if you start at 30 mpg, a 10% saving can be significant if you drive
very much. At 10k miles per year and $2.50/gallon; going from an average of
30 mpg to 33 mpg would save you about $75/year. Pretty good return for
something that also reduces CO2 emission.
It also seems to me that having a working vacuum advance makes the engine
more responsive at part throttle. It's a subtle effect to be sure; but
several times now (on different cars), I've thought the engine seemed
sluggish only to find that the vacuum advance was not working.
But I agree with Jim, I wouldn't bother with vacuum retard.
Randall
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