> A stranded ICE vehicle will exhaust its gas tank in 8 hours, max. You can turn it on an off to stretch it out but I wonder if you'll just burn more gas that w

> A stranded ICE vehicle will exhaust its gas tank in 8 hours, max. You can turn it on an off to stretch it out but I wonder if you'll just burn more gas that way. Idling consumes little gas compared with actually moving the vehicle: https://www.energy.gov/eere/vehicles/fact-861-february-23-2015-idle-fuel-consumption-selected-gasoline-and-diesel-vehicles https://www.energy.gov/eere/vehicles/fact-861-february-23-20... A 4.2L engine burns 0.39gal/hr under no-load conditions according to the study there for a large sedan. Let's assume that the load of putting the blower and heater on equate to even 1 gal/hr (an absurdly high value, the rule of thumb I can find quoted in a few places tends to be add 10-20% depending on interior size and conditions outside). Let's also assume a fuel tank size on the lower end (~15gal) for this sedan. This means in the absolute worst case conditions (you're blasting maximum heat the entire time) around 15 hours of operation for a full tank, 7.5 if you had half a tank. Comparatively, the Tesla, depending on Model, could use as much as 4.8kWh[0][1] under similar worst-case conditions. Modern versions of Tesla and other electrics have or are moving to heat pump heaters, which is encouraging as it will likely be better generally (though this comes with the caveat that they don't work as well in lower temperatures and I believe are supplemented by coil heaters under those conditions). At any rate, the worst-case electric scenario gives a full-charge length of 18.75 (90kWh useable out of a 95kWh pack in the largest long-range models) or 9.38 at half. Note, this is giving the Tesla an enormous advantage here as I'm going with the largest battery pack possible. With the long range pack available in the Model 3 those numbers drop to basically the same as the smaller-tanked gasoline sedans. If you have better sources for those numbers on the Tesla idling with the heaters on, these were all I could find quickly. [0]: https://insideevs.com/news/340327/lets-look-at-energy-consumption-of-tesla-model-3-heater/ https://insideevs.com/news/340327/lets-look-at-energy-consum... [1]: https://teslamotorsclub.com/tmc/threads/idling.139235/ https://teslamotorsclub.com/tmc/threads/idling.139235/