premise: How to fill an air tank<br>Take your air tank to an air compressor. Full-service gas stations or truck stops are the most common locations that have air compressors. You can use the same pump motorists use to inflate the tires on their vehicles.
hypothesis: You can also use your air tank to fill an air compressor
reason: it was a play on words i dont know if the AI knew if an air compressor needed to be filled