340 Gets Terrible Gas Mileage

Sport340 said
Ok would like to resurrect this post. To refresh, I am getting 6 mpg on 1973 Dart Sport 340

Sport340 said
Trying to figure out if the way the timing is set is responsible for the bad gas mileage. If anyone has any thoughts I would be interested. Thanks!

For fuel economy;
Yur ignition timing is all wrong
Yur cam is all wrong,
Yur bore to stroke ratio is all wrong.
Yur combo could also be all wrong.

OOPs you are the OP, my bad, let me get my foot out of my mouth.
You said;

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.

Sport340 said
Thanks for the post. It does seem like it takes a lot to get it going which is what I think you are saying in your first point. You noted 190 psi, what does that refer to? Thanks

because you said

It does seem like it takes a lot to get it going

Before I put my foot in my mouth again; I would like to know;
1) your cranking cylinder pressure, 2) your rear gear, 3) your Convertor stall.

BTW; that device on the firewall, you asked about is a spark delay device. For fuel economy you sorta need to bypass it, so long as so doing does not cause detonation.
Your cruise timing should be about as high as possible so long as the car does not slow down with additional timing. It could be something like; 52/56 degrees at 2400 to 2600. Without a dash-mounted, dial-back, timing device, this would be hard to determine.