So this is what FireCalc tells me (using my projected 401k balance, pension, and SS at 70) for an $80k initial spend adjusted for CPI each year:
FIRECalc looked at the 116 possible 30 year periods in the available data, starting with a portfolio of $800,000 and spending your specified amounts each year thereafter.
Here is how your portfolio would have fared in each of the 116 cycles. The lowest and highest portfolio balance at the end of your retirement was $800,000 to $6,464,840, with an average at the end of $3,305,189. (Note: this is looking at all the possible periods; values are in terms of the dollars as of the beginning of the retirement period for each cycle.)
For our purposes, failure means the portfolio was depleted before the end of the 30 years. FIRECalc found that 0 cycles failed, for a success rate of 100.0%.
But it's a little trickier than that, because my wife and I will have staggered retirements (likely by 5-7 years). So calculating both gets a little complicated. I suppose I could just do her separately based on her spend, but her spending is a little murkier to me, though I think it's around $40k/yr. She's on pace to have @$550k in investments, plus she has a house currently valued at $325k (her parents live there). So assuming the house gets liquidated in the future, she'd have close to $900k (and we should have an additional $100-$125k I'm not really taking into account). So I'm reasonably certain her success rate is close to 100% as well.
Pretty gaudy numbers as far as I'm concerned (frankly, I'm still amazed we've come this far from where we started, which was in decidedly negative territory for me). Our combined $120k spend includes a mortgage, btw. We don't plan on being mortgage-free; it's not necessary, but if we were to get rid of the mortgage, for example, downsizing and paying cash for a new place, the numbers would look even gaudier.
So now I'm just waiting for the Mack truck hit-and-run, or cancer, or lightning strike, etc. to make a mockery of my plans; like the old Jewish saying goes, "If you want to hear God laugh, just tell him your plans."