15.0 mpg to 21.6 mpg!

jos51700 said

I'm not an ignition pro but I know that if you're not running vacuum advance you're giving up a lot.

I think Mopar Action said total with vacuum would be like 50+?

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Yes and not uncommon to get into the 60s, vacuum advance included. Not uncommon at all. And I agree. No vacuum advance is giving up some mileage and a tad bit of part throttle acceleration.