I tried searching for a thread that had some advice, but didn't find any. I have a 2000 Honda Civic HX with a 14 gallon tank. I have dared to use only 12 gallons before filling up. The needle has dipped below "E," and am thus discouraged to drive any more miles before re-fueling. The last 2 gallons appear to be unusable. I just bought a Scanguage II, and am wondering what to enter into it regarding gas tank fuel size, because of not being able to use all 14 gallons. Should I enter 14, or only what I believe to be the portion of the tank that is usable. Thank you for any help you can give.