Originally Posted by opelnut10
...next check the mechanical advance on the distributor.
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You nailed it! Mechanical advance was frozen stiff. A bad rotor that moved 1/4 inch all by itself hid the problem. That and the fact that I never bothered to really look as I'd never had that be a problem in the past. I replaced the distributor with another I had. We will see what happens. To time it in the past, I was never able to get a good initial setting, so I just set it for total at around 35. Now I can finally set initial!
I fueled up after the work to see what happens now. After 108 miles, I got 12 MPG.