It depends totally on where you live. In Ontario, nobody gets away with less than $1000/yr for insurance, and it frequently runs up to $5000, especially if you are under 25.
When I started out on my own (about 15 years ago) I was making $28,000/yr. My take-home was $860 biweekly, so about $1900/month. I spent $500/month renting a room, $300/month for my $3000 car, and $500/month on my insurance. I'm not sure about repairs, but it was probably a few thousand a year.
I was barely hanging on every month. I can't believe I got my student loans paid off with that much money draining away.
I only wish I had thought about being car-free back then.