Not a Hemi but a 3.6 V6

340dartley said
The 3.6 makes around 290 hp in a wrangler. Over 300 in a Charger Challenger. I would expect the valiant to drive like a 340 car and be able to get over 30 mpg.

ABSOLUTELY! Same/better crank hp AND 1/2 the weight.

Even better, its not uncommon for the Supercharged and turbo'd variants to be making around 400hp at the Wheels.