Mine, too. It's pretty great as a car. Gas goes in one hole, exhaust comes out of another, and the wheels go 'round and round. It's awesome.

As an electrical generator, it's really not very good. The alternator is rated at 120 Amps (bigger than many, smaller than others).

At 13.8v, that's only 1,656 Watts -- on a good day, with the engine wound up. But the engine won't be wound up. It will instead be idling. The output will be less than 1656 Watts.

It burns right around 0.6 gallons of gasoline per hour (ie 22kW!) while idling and doing ~nothing else. It holds 21 gallons of gas.

So the unachievable best-case of idling-and-doing-no-real-work means that if it starts with a full tank of fuel, it will run out in 35 hours.

And in the real world, it will be doing work since that's the whole point of the exercise. It will therefore use somewhat more than its do-nothing 0.6 gallons per hour idle consumption.

We can ignore the longevity issues of treating a gas-fired vehicle as a stationary generator (these are expensive parts that are getting abnormally heat-soaked) because this is a temporary solution to a temporary problem, but as a practical matter: I'll still need to fill it up with gas, however I do that[1], about every day.

And, sure: That can be a way to solve some problems. With a decent inverter stashed out of the weather, connected with appropriately-big cables, I can probably use it to run the gas-fired furnace, the fridge and freezer, some lights, and some digital entertainment. Maybe it can't run all of that at the same time, but I'm smart and I'll manage.

The gas-fired car probably is useful, as long as I can drive somewhere and fill it back up.

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Or: I could just plug stuff into an appropriate EV. It can sit there quietly being the giant battery that it is, and I can drive it out every couple/three days, or maybe just once per week as some suggest, to fill it back up.

It won't have an idle baseload of anywhere near the equivalent of 0.6 gallons of gasoline and it will therefore respond well to intermittent, dynamic loads like heat and refrigeration.

The EV is probably more-useful, as long as I can drive somewhere and charge it back up.

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[1]: Sure, sure. I can carry a large quantity of gasoline to make the trips more-worthwhile. I can even store some locally (it's a pain to keep it fresh, but do-able).

If I were into that kind of prepping then what would be my practical limit? An extra 40 gallons, for ~60 overall? Great! Now I can run the car/house combo for 3 days before heading back out, and the EV still probably wins on this metric.