Personally, I think there's a design flaw with the Z's gas tank sending units or the software in the ECU. I've got a 2009 and am on my second set of fuel sensors (there are 2 in the gas tank). First set would "stick" on one dot below full, then after a while would drop 3 or 4 dots all at once, and after that as you drove the guage would unevenly drop towards empty. This started happening after I'd had the car for about a year and a half (about 10,000 miles).
So I had the fuel sensors replaced, and it's starting to happen again after about a year (now up to just under 15,000 miles on the car). And, of course, the 3 warranty is over.
I'm convinced there's a design flaw with the sending units and, at times, the gas gauge is showing more fuel in the tank than there really is. I'll be taking my Z back to a dealer and trying to get Nissan to fix the car on their dime (as far as I'm concerned they never fixed the problem that I reported under warranty).
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