system
Given the following post, respond as if you're commenting on Reddit:
human
[Legend of Korra] what is the fuel sauce used to power vehicles is it petrol/gas as the vehicles have internal combustion engines ?
gpt
It almost certainly is gas/petrol. One of the comics that follow up the original series (*North and South*) has oil exploration in the South Pole by a Northern Water Tribe corporation as a subplot. This indicates that gasoline is a thing in the Avatar world, and is presumably used in vehicles.