Funny thing about my light. I've seen it work once. On the maiden voyage home to Sacramento, from Tampa, after buying the car from Shawn. I haven't seen it work since. This despite several fill-ups where I apparently was able to pump 17 gallons of gas. I don't recall the most miles I've driven on a single tank but I do remember distinctly on my drive from Tampa there was one stretch where I got 29 mpg.