After the last 'cane to hit Louisiana, I was without power for 11 days. Temp's in the 90's during the day, 80 at night. Ran my Yamaha 6.6kwatt generator 24/7 with 2 short pitstops per day to fill up gas and check oil (changed oil at day 5). Constantly ran 2 window AC units, refrig, deep freeze, couple of box fans, TV/Satellite, PC, and several lights at night. I estimate I went thru ~110 gal of gas during that period....and gas was running a little over $4/gal at the time. The 6000 and 8000 BTU window unit AC's made the gas expense WELL worth it!
During this summer, I have been running the genny at least once per week. ANYTIME I need electricity outside (vacuuming car, running shop fan outside when doing vehicle maintenance, etc) I start up the generator and let it provide the juice for me. That way I know for sure it is in great running conditions when/if the next storm hits.