318 MAX fuel economy builds?

Never would've guessed so many people would be highly intrigued and invested in a max fuel economy build over a max performance build. Really cool to see the communities brains come together in my post. 
It's refreshing to look at things in another direction. As fuel prices rise, mileage become more of a issue. How many threads start here with a "cam for my 318" question and end up talking about 400+horse builds. Not everybody wants or needs maximum performance. Those big cube hot rods often times get overbuilt and although they are fun to drive, you don't usually drive them 4 hours to a out of state car show. Also, there is a limit to how much horsepower you can hook up on the street. It can be a waste.