Well I don't know what insurance would be. I pay about $1K total for both our cars, but mine is a little more than half of that as my car has full coverage with liability only on my wife's.

So maybe $2500/yr for my car. To commute on my bike would save considerable money, but the distance would cost me almost 2 hours of the day, or over 500 hours per year that I would not get to spend with my wife and son. To me that's worth far more than the money saved by not driving.