Just ran the numbers: since we started implementing MMM recommendations in 2014, we have cut our spending by 55%... woohoo!
We also retired to do part-time work from home in 2015. We have a decent passive income, but there are still some challenges, due to unexpected expenses (and not wanting to harm our "big ball of money"). In 2016, we hope to continue to lower our spending in the areas of food and utilities.
Our thanks to MMM and everyone on the forum!