I was suprised to see my trip odometer reading at 15 miles before empty tank yesterday as the XC(70) was sitting in the parking lot. As I pulled up the inclined ramp it registered 20 miles, and I drove one block to a gas station and put in precisely one gal of gas. The meter than read 50 miles and blinked up to 55 as I pulled out onto the interstate in search of my favorite gas station who sells fuel about 10 cents cheaper than what that one gal cost me. It is a "blinking light" which as you know has other names associated with it, but the double check for you (as I also use) is the fact that i don't (on my particular vehicle) drive much more than 325 miles each time before I fill up. My hand log of fuel fills indicates that is about where my blinking light, needle, and max fill up quantity says I need to be. You know you can always check the max capacity of your tank, fill it up full, and then figure out how much fuel you really had in theire.