I'm willing to bet "Ellie" doesn't understand what she types, nor understands the difference between electric & gas motors. It is possible to build batteries from lemons!
Note it weighs in at 5,070 lbs. I wonder how many gallons of saltwater it carries and what it does with it after use? This must have something to do with the weight as one gallon of 'standard' seawater weighs roughly 8.5 lbs, while a gallon of gas is about 6 lbs., 29% less.