OK guys, I took a 200 mile round trip to Gonzales today. I filled up before I left and the gauge started acting weird. It never registered all the way full then slowly fell to the white area for 50 - 75 miles then slowly came up to 3/4. It then settled at around half for 100 miles then dropped to the white at about 130 miles. I went ahead and filled up again and could only get 3.19 gallons in.The gauge went up to 3/4-7/8. How does the gauge work? Weight of fuel on a sensor, float gauge, calculations taking in account the phase of the moon or what?