73 Dart /6 MPG

Spec (TDC) is good for creating mushy acceleration and poor mileage. Try 5°BTDC with the engine idling at 600 rpm and the vacuum advance hose disconnected from the distributor and (hose) plugged. Then reconnect the vacuum advance hose and readjust your engine idle speed to 750 rpm, making sure both the idle speed and mixture are set correctly per this post.