WHat does your fuel gauge in the instrument panel show? If that dsiplay is correct, then your sensors are fine. If I am not mistaken, the OBC makes the calculations based on the fuel consumption at the time it is displayed. In other words, if you have 10 gallons in the tank and are driving at 20mpg, the OBC will display a range 200 miles. However, with the same 10 gallons left, if driving at 25mpg, the OBC would display 250 miles. I am pretty sure this is how it goes.
Again, if the fuel gauge works fine, then your sensors are fine.
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