Re: No Backup Gen?
Even with your exorbitant petrol costs[0], it won't cost a couple grand for a few days. 4 US gallons (15 liters, close enough) is more than enough to keep an American sized fridge, large deep-freeze, a window mounted 12,000 BTU air conditioner, and all the lights, TVs, comms gear and computer stuff going for a family of four for a day, during the height of summer here in Northern California. (Some, if minimal, plug-juggling required.)
That's running the genset for a couple hours in the morning, a couple hours mid-day, and pretty much all evening.
Keeping the contents of the fridge & freezer from going off more than pays for the fuel.
Keeping the lager cold on a hot day without lugging ice from the convenience store is worth the price of admission alone.
Keeping the kids/wife from whining about the heat: priceless.
[0] I'd actually recommend Natural Gas for a permanently mounted home unit, not petrol. And not just for cost, either ... long-term petrol storage is a royal pain in the arse.