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Old 02-09-2021, 04:47 AM   #125
ChevyRacefan
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Location: Newton,N.C.
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Re: What kind of gas mileage do you get with your 67-72?

Quote:
Originally Posted by Rich72C10 View Post
Rats, at mechanical (no vacuum on Distributor) I am at 23° at 2.5K RPMs
The dead vacuum advance can, and the 23* total , is a big part of your mpg issue.
What is the initial timing set at?
AND what is your cruise rpm. is it lower or higher than the all in (timing) rpm of 2500?
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