I don't know if its similar, but I've noticed a "delay" in my gauge (on the Sport). For example, I'll happen to notice its at 1/2 tank on my way home from work. Park the car, and its still at 1/2 tank. Later, I'll get in and start it up and all of a sudden it'll drop 1/8 of a tank. It'll hold there until I stop and restart, then it will drop again. Is this like what you're experiencing?
On long trips the needle will gradually drop like it should; this only seems to happen on short trips. I haven't complained only because its really not a problem for me. I hardly ever let it fall below 1/4 tank.
