When I fly to SFO after work, I arrive pretty late (close to 10 p.m.). I like to stay at the SFO Marriott, then rent in the morning from Bayshore, drive to wherever I need to go and return to the airport location when I have to fly back. Works like a charm, and no $12 charge. The first night is usually cheaper at SFO, also (but I have to move).
Bruce