Yeah, chances are good that nothing will happen and no one will know... but the rules are there for a reason. If something should happen, I would hate to see the next day's headline: "Plane Engulfed in Flames Traced to Flammable Liquid Carried On by Idiotic Backpacker". <img src="/forums/images/graemlins/tongue.gif" alt="" />

I don't think we backpackers should smuggle fuel onboard and put everyone else at risk just for our own convenience.