Big Block A body Mileage?

LOL, big block are know to have crummy mileage. I remember a girl posting about hers and how to get more. At the time, she was getting a posted 17-18 on the Hwy. I thought it was good.
I get about 13 in my '79 Magnum on the Hwy. 400/727/3.21 and 26 inch tires.

Sqeaking out mileage with a big block is counter productive to seeking power. I think the easy things need to be done first before you start and try to re-engineer.
Once you start changing cams and etc... your done and it's over.