I know a guy who powered his house in a St. Louis Winter outage, with a mid-90's Miata, 1000-Watt inverter and a little extra idle speed. It generated for close to 30 hours and used something like 4-5 gallons. A natural gas fireplace offered heat, but the "Mazdinverter" ran whatever else was asked of it.
Any car can really become a household generator, with the right equipment. What you really need is a hybrid transit bus with a grid return hookup to power the neighborhood (actually used in the California rolling blackouts a few years back).
-RH77
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“If we knew what we were doing, it wouldn't be called research” ― Albert Einstein
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