Brand new 2015 Nissan Leaf all-electric!
No gas money necessary! 65 mi range on freeway without charging, 85-90 mi around the city.
There are quick-charging stations all over the bay area (use an app called Plugshare to find them) where you can get most of a full charge in <30 minutes, and I have (you have) a pass to access most quickchargers for free. Also comes with a home charger in the trunk, which will give you about 5 miles of range per hour of charging on any house/garage's standard 110V AC outlet (and I can help you with any charging questions you have during your rental period).
You'll love the ride! Full torque at low speeds means an incredibly sporty ride in traffic.