Im having an issue with the Driver Information Center on my 06 Cobalt and was wondering if any one else has seen the same thing. The Economy or MPG use to be pretty consistent with a range within 3 or three MPG. Now it shoots from 70 to as low as 10. Im not sure if this is just a setting that I need to change or if I need to have it in for some warranty work. Please let me know if anyone else has experienced this.