I think it depends on whether you regard Mustachianism as a philosophy or as a set of practices. If you look at it as a philosophy, you re-examine your spending, think about true costs, consider the cost of debt, re-examine societal "givens" like a long commute or a big house, etc, etc, consider your own goals, constraints and the other people involved, and then come up with a set of practices which likely overlap with but may not be identical to MMM's approach. If you look at it as a set of practices, you bike, skip eating out, cancel cable, learn to do your own home repairs, etc.
Good point.
From a philsophical perspective, I call myself a (non-hard core) mustachian because I've taken to thinking more holistically about how my spending aligns with my priorities. Recently, I spent on money on change flight fees to attend a wedding we were invited late to (after booking flights for another wedding a few days later). It was painful, yes, but DH said he thought I'd regret not going more in 10 years than spending the money on the flights & change flight fees then. He was right. So, we went and I "forgave" myself for this spending as being worthwhile. I started to brainstorm a few more situations to relate here (spending on a baby shower and a friend's wedding, etc.), and I realized they all boil down to prioritizing relationships and people over things.
We already were reasonably frugal for our income, not spending what we could and couponing/buying on sale, but in other areas, we've cut back:
- No cable - thrilled to spend more time outside, talking, reading, etc.
- More homecooked meals - thrilled to eat better food. I miss "lazy" meals out sometimes (really I just wish DH would cook for me sometimes rather than always out, me, or us), but I'm working on creating a repetorie of easy meals that take ~20 minutes to put together for the tougher nights.
- Bringing in more lunches - happy to eat better food and save money.
- Bought a reel mower to avoid spending on gas and get a little workout. Fixed it when it broke
- Learning other DIY repairs around the house
- Switching highly used lights for LED (cut $35/month off the bills!)
I've also made some philosophical changes such as working to in a small way, declutter and focus more on minimalism so we bring less "crap" into the home.
We are most definitely not the best example of MMM, because we "only" save about 50-60% and we recently bought an expensive house. I want to do more in the area of learning to DIY. But we're really happy with where we are (love the house and what it offers us) and even think we need to loosen the reigns on some areas like traveling more. Mostly the mind shift for me has been recognizing what matters to me - and recognizing I truly don't want the "things" so it's no hardship to not spend. Everything I listed above has another reason to do beyond just saving money, from more time gained in my day, healthier food or lifestyle, more environmentally friendly, etc.