This dealership may be the only honest dealership in the nation. But they wouldn't have known the answer to that question.
However, now I know the answer! It DOES NOT!
I found this out the hard way. But I was so friggin lucky. It goes without saying, I bought the car, drove it home yesterday.
All in all, the vehicle is in great shape. Yes, it has a few issues here and there and I will go about trying to resolve or improve them. But ... about the fuel gauge, let me tell this quick story.
So I topped off in Maryland, about an hour to the left of DC. It was raining like a bastard for about 2 hours, and then it cleared up. All systems seem to work well on the car (put through its paces in the rain).
After the rain, I just went into fuel conservation mode, to see how far it would get. I passed through Charlotte, NC. After Charlotte, the fuel gauge was about 1/4 tank or so. I was going to need to stop, stretch and get a drink, so I went ahead and looked ahead on my route to find my preferred gas station. I found one about 60 miles ahead and decided I could plug along and make it there. The car was running good and getting great mpg. Within seconds of plugging in that intended fuel station, I come upon some road construction and it is about 2 am (night work in the construction area). They were blowing dust over the travel lanes so I canceled the cruise. When I did that, the Check Engine light came on (but nothing else seemed to happen). But I said, uh-ohhh. I went to down shift to 5th and when I pushed the clutch the engine died. I said UH-OHHHH. I put it in 5th, eased off the clutch, the engine came back. I put my foot on the gas but NOTHING. I then realized the engine was dead and momentum was the only thing turning it.
LUCKILY, I decided to pull off, into the construction zone right where there were workers. Because before and after that there was like NO CIVILIZATION. I got out of the car and went and found some workers to let them know I hadn't intended to get in their way, but the car just broke down. 2 of them broke off from the rest and came and helped me. First they asked if I was out of gas. I said, I don't think so, the gauge was on 1/4 tank. But then I realized, I've got 499.7 miles on this tank since I filled it. So, maybe the gauge is goofy.
I told that to the workers and they said, hey, we've got a can of gas, let's just see what it does. So they went and got the gas, put about 1/2 gallon into the G35. I turned the starter and it fired right up. I was so lucky it chose to run out of gas right there. Or I would have been ... a word that starts with f, and ends with ed. About a mile down was a gas station. So I filled it up. It got about 25.5 mpg.
The tires are low quality. It does on/off a bit when on the cruise and going down hill. But it didn't seem odd at all. It was very subtle, and felt totally expected.
Aside from wear and tear, and replaceable stuff like tires, it seems to have a couple discs stuck in the 6 disc changer. So I'll search for a way to resolve that. But otherwise, the car is SOLID.