Final answer:
The exact number of gallons that triggers the Low Oil ACAWS alert varies by aircraft and is found in the operating manual or maintenance documentation.
Step-by-step explanation:
The question 'How many gallons sets off the Low Oil ACAWS' is likely related to aviation since ACAWS stands for Aircraft Caution, Advisory, and Warning System. However, the exact amount of gallons that would trigger the Low Oil ACAWS alert varies depending on the specific aircraft's design and the thresholds set by the manufacturer or the aviation authority regulations. Aviation professionals and engineers typically refer to the aircraft's operating manual or maintenance documentation to find such specific information.