another thought here is that the avg mpg is calculated from the very first
time it is activated. so it may be telling you that the avg mpg over the
past 14 yrs is 26 but not recently because your motor is not as fresh as it
used to be. i believe you can reset the display also by holding down the
button of so... look in the manual on how to reset the display then see if
the avg mpg is consistant with what you calculate by hand after the sensor
was reset. let me know what happens.
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