I'm not worried, just my curious nature at times. Oh the TCH was definitely the right choice for me. I am seeing a realized 52% savings in fuel after 3 tanks. My Bonneville SSei was getting 19mpg combined avg and my TCH is currently at 36.5 lifetime avg. (This tanks the computer says 40.6 right now.) The reason why my savings is higher than it looks is because the SSei required\recommended premium fuel. So the TCH is not only better on MPG but also price per gallon.