From that smartmoney link
the center estimates (based on decades of research at Georgia State University) that households with annual earnings of $50,000 and over will need 80% of pre-retirement earnings to maintain the same level of consumption in retirement.
Before we retired we tried to find examples of how much money we would need if we were prepared to "drop out and live in a bus" and not "maintain the same level of consumption".
We could find nothing.
Every study and every financial advisor assumed you want the status quo.
We went ahead anyway and have never looked back.
Thankfully these days people have blogs and forums like this that show then it's not only possible but practical and enjoyable.