CO, do you wait for the low fuel light to come on or what set point do you refuel? according to the manual our cars have a 12.8 gallon tank. i've never got more than mid 9 galon in when the light would come on.
I might have to do what clencher does and find out what it takes from dead empty.
Lx, fill before last when I got 803 miles I hauled around a 2 gallon can of gas for 170 miles with the low fuel lite on. I put in 12.48 gallons when I filled. I go more by the miles I have driven. Last fill a couple days ago was required by the FE Challenge, I was on my way to a 900 mile tank.
I have a suggestion for you. Make sure SG is set for zero correction for tank fillup. Always do 1 click past auto shutoff fills and believe your SG for the gallons used. Do not reset the SG to adjust to what you pumped. First tank may depress you because you probably won't be filling as full as you were before. It may take a couple fills to get SG stabilized but then you can believe what it says, for gallons used and tank info. Otherwise you are telling SG it is wrong and to adjust for what you think is right. You are not getting what SG is designed for when you interject commands to change it's calcs based on questionable pump fill amounts. It works for me.