If you wanna spend more money on a inferior performing engine, go ahead. Ill go with a less expensive motor that does everything better. 30+MPG on the freeway with 450+HP on tap, thats pretty damned impressive. Dont even get me started on boosted LSx based motors. Talk about cheap power.
You're kidding yourself if you think you're gonna cruise around and get 30mpg. By the time you add gears and boost you can forget it unless you drive like you're elderly.