Earlier quoted context omitted.
No, it is not, because I am not assuming a promotion to prove my point re: whether you can save money in SF as a single engineer. You can. That's it.
No offense, but I'm strongly inclined to believe that you are not making it by on 80k a year in SF, and if you made that little money at one point, it was not for an extended enough period of time for you to properly understand what it afforded you. Your estimates seem to be nothing more than back of the napkin calculations missing major components like half of the taxes. Your numbers fit to someone making 100k+. Edi…
As far as addressing counterpoints, I've grown tired of quibbling. I think that you can live comfortably spending 66% of your income net of taxes per year without any undue effort if you make $80k a year in SF. I think anyone who looks into it would find the same to be true. That's my last word in this conversation.