I'm not volunteering to do this (I'm not advanced enough to know how), but I've been thinking it would be cool to have a sort of super-powered mustachian calculator - either an excel spreadsheet or a website, where you can factor in a ton of different aspects of life, and somehow get the type of results that are helpful for people aiming for retirement. I'm thinking something like the NYT housing calculator, but for mustachianism - savings, spending, income, real estate, loans, and so on. You could even calculated a mustache score based on the input! Or it could compare with the average citizen, or the average mustachian, or with the MMM family themselves.
I know a lot of us use some sort of system for ourselves. How hard would it be to combine minds and make an ultimate MMM calculator?
This table might be a good start...
...just a thought! :)