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Hi,
You have to calculate the mileage by dividing the total mile by the amount of gas you actually pump; because the gas gauge is not accurate enough -- and unless you run it dry, you will never use all 11.9 gallons. And even then, it is unlikely that you could get precisely all of the gas out of the tank.
As I said before -- I'll bet you are getting much better mileage than you think you are. Keep a log and do the math -- you will be happier with the results.
And please do calibrate the SGII using the Fillup screen to adjust the amount that it "thinks" you have used to be what you actually pump in. If you use the same pump each time, and try to fill it to the same point, you will get it to be much more accurate after 4 or 5 fillups.
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