So I got into my car to go to work and noticed the mile to empty was reading around 270. The problem? well the tank was 3/4 of the way full. So i stopped at the gas station and filled the tank completely, get back in and it's reading 386 till empty. As I drove to work (about 10 miles) I noticed the MTE went up to 395 but thats it. It's been my experience that once I fill the tank I get around 450 to 500 MTE. I have no idea why all of the sudden it's reading 100 miles low? any ideas? One thing of note is I filled the tank with the car running, but that it always my habit and have never noticed a problem?