I work for a vision impaired couple, she can see a little(but is more than legally blind and cannot drive), he is completely blind . They tune and repair pianos. I drive them and help when they need it. One day I was driving with her, in the '08 Escape hybrid. We were going to pick up her husband at their house. He was waiting outside. They do live on the corner of a pretty busy street, but there was very little traffic at this time. We were able to roll up in the driveway in EV mode one time, and he didn't hear us. We both sat in the car for a few seconds, waiting for him to get in. As he has done in the past when he heard us pull up. He didn't move until I rolled down the window to talk to him and the engine kicked on. She was in disbelief that he didn't hear us. He is in his early 50's, has been blind since he was a teenager, and she has been married to him for 30 years. She said that it is near impossible to sneak up on him. He will hear you, smell you, or feel the air move. But we did it in a car. She still remarks about it, and he swears we weren't really there. :hysterical: Haven't been able to do it since. After telling them about the Cmax, she said maybe we would be able to do it again. He says, "Yea, like to see you try". So, one day I will try, but he will be expecting it, so it won't be easy.