system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 What makes gasoline so special that it can power engines and why is it so difficult to find an alternative fuel source?
gpt
it's flammable, high energy output, easy to transport, and stays liquid in decently wide variety of temperatures.  

lots of things can power an internal combustion engine.  diesel,  peanut oil,  alcohol to name a few.