I must have a good setup then. Just this past weekend, I was just below a quarter tank, and I put 35 gallons in, it clicked off when the fuel was in the neck of the filler. I clicked it to the next even $ amount. I put over 650 miles on that tank, and was just below a quarter again. I know that my guage is accurate...... so I am not sure.... but I do know there is no restricition in the fill tube, the inside of the fill tube is the same size as the tank cap all the way down.