more rough numbers: I live in an Australian city with decent public transport -- well, decent in patches. It costs about USD $3.3/day for public transport fees if you take the train every day all year. I don't need a car. Now I mostly commute to work on bike (15km return). It costs maybe USD $140/year for bike parts and repairs on a bad year, call it USD $0.4/day. I still use public transport a day or two per week, so that's maybe plus USD $1.2/day on average.

On the other hand I pay a bit more in rent to live somewhere with easy bike and public transport options.