Here's a typical programmer bachelor situation.
I made about $6000K after tax and contributions to retirement account in SF and NYC.
car = $0
insurance = $0, paid for by employer
other debts = $0
iPhone = $80
rent = $1000 studio or share
utilities + wifi = $250
metro card/transit pass = $80
You can fudge those numbers a bit for a better apartment/room and maybe zip car or even your own beater car, and you're still usually under $2K. I didn't put food in there because that was highly variable, even for me. I saved $24,000 a year without thinking about it, and still experimented with motorcycles, snowboards, music gear, travel, etc.
You essentially have $4000 - $4500 a month to save or spend on food + whatever you want.