Since radios don't use tubes anymore, and laptops can run for hours on
a small lithium battery, this doesn't make environmental (carbon
footprint, air pollution) or economic sense. A brief web search found
alternatives.
>
> https://afdc.energy.gov/files/u/publication/idling_emergency-service_vehicles.pdf
> is five years old, but there are a lot of sites advertising devices to avoid idling."
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