BTW I remember some thread somewhere on getting electric power from a car generator by running th e engine. It is a similar case of non-ecocnomical way of getting enough of what you need versus what you will be spending. An engine is suppoosed to move the car (mechanical) and only a small part of its power goes to the generator (electrical) and you will be wasting too much gas for too little electricity. It is similar to getting water from air. And is only adviseable if you have large (unlimited ? ) amounts of the resource and you critically need the product.