Re: Terrible gas mileage,
As said, we don't know your usage, loading, terrain and possible Holley carb internals. Even with a 305, that's pretty low MPG. Unknown history from PO. If you 100% positive about ratio, great, but could have 3.92 real easily. You can't do accurate ratio calculation by tire/shaft rotation.
You may be falling into the category of "playing with it too much", "modifying" too much. Original factory motor Synergy gets out of whack. Go back and try a 350 CFM original carb. You could be wasting gas.
Last edited by AZKen; January 26th, 2019 at 01:55 AM.
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