Does anyone know if the passenger seat is supposed to make rattle noises when the road gets really bumpy. It's starting to annoy me and I need to really turn up the music to block it out. And I am positive it's the front passenger seat because when I shake it, it makes the noise I hear. Also can someone explain the MPG gauge for me. When I put in gas, it goes at 8 MPG and slowly goes up when I add on the mile to 15 MPG and later goes to 18-20 MPG. I don't think I have ever gotten more then 20 but I haven't been in the freeways for long periods of time. Just wondering if these problems are suppose to be normal or not?