Need recommendation for a Carb for better MPG!

I appreciate what you are saying but I'm not that guy. Everyone is different. I'm mostly in love with the body style and I would have bought the Demon if it had a slant six. Yes, the extra power is absolutely fun from time to time but it's not a got-to-have for me. I have a 2010 hemi Challenger, and I average 26 mpg, for real on my commute. I just like staying away from the gas stations as long as I can. It can be done. Everyone here has been fantastic, and I love the variety of comments!
I don't get it, why have a 340 and detune it to become a sled? I would want my 340 to get 8 MPG and become a "Fire Breathing Animal".
.