Whats the most gas anyone's put in their FX? I have never put in more than 18 gallons when the low fuel light is on. Today I tried to run my 45 as low on fuel as I could. It only took almost 20 gallons. Aren't our tanks 23.8 gallons? When I pulled in to the station, the computer said there was 15 miles of gas left, which at my 13.5 MPG, that should be about 1-2 gallons (figuring the computer is not perfect). Does the computer count the reserve?