nah i put 10$ in the tank. so it was under half a tank at $1.92 a gal.
i reckon its not indicating the proper level because on about 5 gallons ill get 95 miles more or less on the trip meter. and i fill it up with 10$ when the gauge gets in to the red. and lately its been above half a tank settling at 3/4 tank.
so no it shouldnt jump around. i was just driving it today showed 3/4 tank when i know its under 1/4 of a tank atleast.