Why can't I reset my average fuel economy information light buttonn?

If you have a steering wheel buttons-- just press the check at the lower right side of the steering wheel-- with the average economy showing. If not here is the owner manuel suggest:Press the fuel information button until AVG ECON appears in the display. Average fuel economy is how many miles per gallon your vehicle is getting based on current and past driving conditions. Press and hold the select button for two seconds while AVG ECON is displayed to reset the average fuel economy. Average fuel economy will then be calculated starting from that point. If the average fuel economy is not reset, it will be continually updated each time you drive.