Originally Posted by rjque
For 24 hours, I would just hang on to the car rather than go through the bother of returning it and using a taxi in and out of SF. Even the most expensive hotel parking will be no more than about $40 for the night. Taxi fare both ways will be in the $90 range. Taking Bart will cut the cost of dropping the car to about $10 per person, but even if I were doing this alone, I don't think the hassle would be worth the $30 I would save by avoiding the parking charge.
I'd differ with your analysis, at least in part. Parking could be up to nearly-$50, but this wouldn't be the maker/breaker. If I could save a full day of rental and parking, and save the time to return the car @ SFO, I'd return the car in the City and take a taxi to the airport the next day, saving a lot of time/stress on the airport trip.