While I absolutely hate the gas gauge lights, mine has been highly accurate each and every time. (I can't say this on my 350Z as the fuel gauge would show empty and I could still go over 100 miles on the tank).
I separately track the MPG on an iPhone app it's consistantly within .2 mpg within what the trip on the car states. I get around 380 miles per tank, so the 350 range is where I start looking for my favorite gas station.
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