That’s one of my long-time favorite personal finance books! Although I found some of their metrics rather amusing — for example, looking at the average dollars spent per pound of car weight… :)

Also, as I wrote elsewhere (https://medium.com/financial-strategy/how-much-should-you-have-already-set-aside-by-your-age-dd33bfb631e1), though the “wealth formula” from MND is a decent starting point, it is misleading in some cases.