Blast-

I know gas is expensive but this surprises me. My 6.5 KW can run 12 hrs on 7 gal. (Not that I would run it 12 hours at a stretch). I would guess a few hours a day would keep the freezer/fridges cold if not opened much. I plan to run it 6 hours/day. That's 3.5 gallons, or 14 bucks a day. Do you consider that outrageous? And spread between multiple families? That's cheap, man! 14 bucks to keep a whole lotta steaks o.k. sounds decent to me.
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When the SHTF, no one comes out of it smelling pretty.