PGE Electric Vehicle Rate Options(11-4-2016)
EV rate calculator

Looks like EV-A is the way to go. No second panel to install.
$70 more a month estimated for Home + PEV + EV-A for Nissan Leaf and 80mi/day.
Gas cost per month: (80mi/day)*(30days/month)*($2.50/gal)/(25mpg)=$240/month
Gas cost per month: (80mi/day)*(30days/month)*($4.00/gal)/(25mpg)=$384/month

Details on EV PGE rates(1-4-2016).
Energy Rates(kWh)PeakPart-PeakOff-Peak
Summer Usage$0.44549$0.24311$0.11628
Winter Usage$0.31374$0.19197$0.11904

2:00 p.m. to 9:00 p.m. Monday through Friday. 3:00 p.m. to 7:00 p.m. Saturday, Sunday and Holidays.

7:00 a.m. to 2:00 p.m. and 9:00 p.m. to 11:00 p.m. Monday through Friday, except holidays.

All other hours.

"Holidays" for the purposes of this rate schedule are New Year's Day, President's Day, Memorial Day, Independence Day, Labor Day, Veterans Day, Thanksgiving Day, and Christmas Day. The dates will be those on which the holidays are legally observed.

Seasons Definition:
The summer season is May 1 through October 31 and the winter season is November 1 through April 30.

Car pool access is until Jan 1, 2019 (1-11-2016).

Used Nissan Leaf on Craigslist SF (1-11-2016)
2016 Leaf: 5300mi, $16,599, ?, Dlr
2013 Leaf: 28450mi, $11,950, Sunnyvale, Dlr
2012 Leaf: 27218mi, $8,273, Sunnyvale, Dlr
2011 Leaf: 56,000mi, $6,000, Sunnyvale, Private
2015 Leaf S Quick Charge: 19,000mi, $11,000, Santa Clara, Private
2015 Leaf Quick Charge: 20,000mi, $14,900, Milpitas, Private
2014 Leaf S Quick Charge: 24,400mi, $9,000, Santa Clara, Private