Re: MPG Meter - Cadillac, Lincoln, Imperial
From: Brian Holm (peugeots@vtlink.net)
Date: Fri 26 Mar 2004 - 19:44:27 EST
But I want to know actual mpg. The vacuum gauge can do a lot of things,
and I use one regularly for diagnosis, but it can't do that. Also, I am
skeptical of the precision of the relationship between high vacuum and
mpg. To keep the vacuum up you have to keep the revs up. On an upgrade,
or under acceleration, when the vacuum drops downshifting will bring it
back up. But that is not necessarily more economical.
In fact the driving style of the economy run drivers in the '70s was to use
zero vacuum all the time--wide open throttle to 50mph then shut off engine
and coast in neutral to 15mph, then full throttle to 50 again. I was told
that this worked because of throttle plate carburetor design. The
venturi's efficiency is greatly disturbed by a partially open throttle
plate. I have no idea how this applies to normal driving, with fuel
injection, but I want to know mpg based on distance travelled divided by
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