Nice question, but it reminds me of a flawed question that appeared on one of my kid's high school science quizzes. It should have been easy, here it is" True

Nice question, but it reminds me of a flawed question that appeared on one of my kid's high school science quizzes. It should have been easy, here it is" True or False, turning off the radio in the car gives you better gas mileage. Obviously, the energy for the radio comes from somewhere so True. However, my daughter who didn't drive at the time thought that car batteries where like ordinary batteries around the house and where simply replaced when the big things ran down. When I grew up, cars were far from reliable and it was pretty common to carry jumper cables so even kids just kind of knew that auto batteries where rechargeable and that the car contained a generator (alternator). Drawing a bike would be easy for me. I've owned numerous bikes and even taken them down to bare frames to maintain them, but I'm not educated to be a mechanical engineer at all.