That's a nice goal, but reality will probably hit you in the face.
I have to drive really gently to get 24 mpg out of my 300M with the 3.5 v6 and 4 speed auto trans driving mostly rural with a little city traffic mixed in. Not to mention the 300M has way better aero than any of our old cars.
The smaller/lighter '08 Avenger R/T with 3.5 v6 and 6 speed auto tranny is only EPA rated at 24 mpg highway.
So with 408 cubes and a 4 barrel in a brick, you'll be doing real well to crack 20 mpg at 60 mph.
Scott B.
"I'm a self-made man... I started with nothing, and I still have most of it!"
68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph
69 340 GTS stock 14.18@ 95.60 mph
01 5.9L Ram 1500 Quad Cab 4x4
01 3.5L 300M 16.23@ 86.97 mph