I noticed that the past two times I filled up the gauge did not read all the way full even though I had milked the pump until the was at the top of the filling tube. I also notice it was showing empty and I could not get even 16 gallons in to fill it up when it holds more.

My 1st service was due so I told the advisor, they checked, and sure enough the main and sub sending unit was reading out of spec when tested. There is one in each side of the "saddle bag" style gas tanks we have on our 2007 Gs. Anyway, 1st one in SLC to have this issue. It apparently was an issue in the past with the previous years. Works great now. I even got a 2007 as a loaner car for the day.