Hi Marc,
I don't understand your comment on vacuum advance. Pretty much all
engines give significantly better mileage if you increase the timing
advance under light load conditions, which is what the vacuum advance
mechanism does, or at least, that is what it's supposed to do. As soon
as your foot goes into the throttle, the vacuum goes away, and the
timing becomes governed by the mechanical advance. Properly set up, you
get the best of both worlds: Extra advance at low power settings for
good mileage, and the optimal advance for maximum power when the
throttle is wide open.
I'll grant that having an extra advance mechanism opens the door to
having that advance cut in at an inopportune time due to some component
failure, but there are also many other ways that the ignition timing can
be messed up. The use of vacuum advance is not a unique risk in that
regard.
Cheers,
Theo
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