It'd be more fun if the gas kinda 'leaked' out of your energy, and poured onto the ground through the can: Your energy wouldn't refill until you set the gas trail ablaze, or something.
Even better would be an alternate fire for the gas can: The first fire, left click, would pour gas on the ground: Second fire, right click, drops the can completely, propane-can style: If something hits it, BEWM, medium size high-damage explosion.
I figure that the globules of gas would be vehicles or something, and explode on contact with something.
