Learned my lesson after hurricane gustave, lost power for over a week. Gas generators kept my tank running but are a pain and I nearly ran out of gas. They also do nothing to help with heat. When ice is at a premium, it's hard to convince the gf to use most of it to keep a tank at temp.
Realized I needed to be better prepared for next hurricane season. Initial cost are a bit high but power outages are a thing of the past.
http://www.generac.com/Residential/G..._Series_20_kW/