I haven't been driving my 65 Dart 273 regularly yet, but hope to do better. Is that mixed city/hwy miles? If so, not terrible, especially if short trips with a cold engine. You might try running leaner. The big spark may make that possible. Not real easy with a carb, unless yours has metering rods (Carter or Edelbrock I think). I have Holley TBI in my BB, so as easy as turning a knob, though I have O2 feedback anyway.
