[Healeys] Which electronic ignition?

[ah at jharper.demon.co.uk (John Harper)]

Just a query.

I read in many documents in the past that the vacuum advance in an 
original distributor, advanced the spark on light throttle so as to 
compensate for the slower combustion burn with weak mixture. Without it 
higher fuel consumption whilst cruising is likely. I have experienced 
this myself when a vacuum unit has failed when the diaphragm is 
punctured.

Some of the options listed in previous e-mails do not have any method of 
measuring the vacuum from the carburettor so I have to assume that these 
are less fuel efficient on long, steady speed journeys.

Any comments please

Regards
-- 
John Harper