I have only 800 miles on my new '09 nismo. So not fully broken in for sure. Getting 25.6 according to the car computer with the cruise set on 78mph. Using 93 octane.

He's not good at math.

I did something just as stupid when I was 20. I drove my 97 Formula from Los Angeles to Las Vegas in 2 1/2 hours. I averaged 125MPH for a 303 mile trip. I started at 4am and got there at just a little after 6:30am. (I stopped to get some beef jerky). The fastest I went on that trip was just over 140MPH and I slowed down to 90MPH when coming up on big-rigs so I didn't get wind washed off the road. I was extremely lucky on that trip because I didn't kill myself or anyone else. I didn't have any close calls which was shocking because I wasn't on the right tires to be going that fast. I had 2.73 gears, so my highway mileage was insane... On 15 gallons I went a hair over 410 miles total.

Now that I'm more grown up and I'm not a total tool behind the wheel, I don't drive like that anymore. I know that sounds harsh, but it's the truth. Doing triple digits on the highway is stupid and dangerous not just to yourself but anyone else around you.

I've hit triple digits with the Z, I hate to say it, fairly often, mostly because it just runs up there so damn smooth that you don't realize that your going that fast. That in itself is what makes that kind of speed dangerous...in my case it's when I'm passing someone who can't stay in their own lane. Sometimes I slow down and keep them in front of me, other times I jump around them and gain some space, and when I look down, I usually hit the brakes, or just let the car wind itself down...depending on how far over the limit I am and how likely it would be to get caught. I've also found myself going a lot higher the speed limit off enterance ramps. I gotta quit that...lol

On that note, I called 911 to report someone going the wrong way on an exit on the highway ramp (as in, they were getting on the highway going the wrong way). I couldn't believe it...

I think we all know the difference between going 113MPH for a long distance and going 100MPH for 2-3 seconds. I catch my dad doing that once in a while. What's interesting is that it's REALLY easy to keep speed down in my Z06. Once you go over 90MPH it lets you know you're going too fast on the heads-up display on on the driver information console.

Not my first full tank, but at ~10,000 I got 400+ miles on a tank multiple times during a road trip, 95% highway driving.

I doubt I'm the only one...

Actually, you live in a city of nearly 6 million people, with some pretty horrible traffic at times.

I go from Downtown LA to my parents , which is an hour north of Sacramento, on one tank every time.

mileage
 

Mile 370 Nismo has about 900 miles on it. According to the car's MPG it said I got 25.2 mpg and I had the cruise set on 78mph on about an one hour trip. Not too bad but again I didn't get the car either for fuel economy. I would expect the mileage to creep up a little after 3000-4000 miles on the engine.