340 Gets Terrible Gas Mileage

Sport340 said
Hey guys, brand new to the forum. I just recently (about 30 days ago) bought a 1973 Dart Sport 340. It has a 340 with a performance cam, Edelbrock 650 4 barrel carb, headers with the Torqueflite automatic transmission. The first couple of tanks look like I am getting a little over 6 miles per gallon. This is all city driving but surely I should be getting much better gas mileage.

I'd appreciate comments on what mpg you think I should be getting and where should I start in trying to improve this.

Thanks

Dave
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What is the "performance cam?"
What rear gear?
What rear tire size?

Be honest do you keep your "foot out of it?"

And what kind of driving we talking about, suburban fair number of stops/ lights, or highway, or what, and what cruise speed?

What does the tach turn for XX mph, say 55, 65, 70 whatever?