The Ray Sphere was a device used by transferring the neuro-electric energy from a group of people to concentrate it into a human indevidual to unlock his/her powers. Though it will unlock the dormant abilities of the Conduit, it will kill the catalysts, and worse, cause a catastrophic explosion.
How many gallons of gas does the average mid-size car hold? The average fuel tank size for mid-size cars is 16 gallons. If the  price of gas was $3.59 per gallon, it would cost $57.44 to fill a  16 gallon tank.
How Many Gallons in a 20 Pound Propane Tank? A 'full' 20 pound propane tank would contain 4.73 gallons of propane. Note that in some US tank exchange programs, the fill is something less than 20 pounds and is labelled accordingly. The image above is a typical 20 pound (9kg) propane tank.