When I went to school in Boulder I didn't have a car and I walked everywhere, rode a hard tail entry level mtb or took the bus(and I waited tables and that was about 2 miles from my house and I walked daily to work, even when I got done late at night or worked a double) . Granted, public transportation in Boulder was a lot better then Dayton. My grandfather lives really close to DU( within walking distance). Dayton is definitely commuter friendly enough that I would also consider selling the car.

Maybe you find some babysitting jobs once or twice a week to bring in some extra cash?($10 an hour is a normal rate and it is cash under the table) you could easily make an extra $50-100 bucks a week and have food money. Most kids go to sleep around 8 or so, so you could study after.