Don't know. I get around 23-25mpg at Interstate speeds. 70-77mph. Low tire pressure can cut the mileage by 2mpg. It has for my car. I just checked my TP and they were low. Around 29psi. Supposed to be set to 35psi. My mpg drops, I check the tire pressure.

I have never seen 26mpg. I don't really care though. I just fill up and enjoy the ride.

26 mpg on trip computer at 75 mph steady.

Here's hoping....
 

Here's hoping once I get more miles on my Z the numbers improve. (only 1400 miles now)
I'm not seeing anywhere near the mileage of some of you guys are saying you're getting, and I'm running a larger Imperial gallon in my calculations. (5/4th a US gallon)
It is my understanding (from Nissan ratings) they'll get about 33 mpg tops on an Imp. gallon. That's about 26-ish on a US gallon, HWY mileage.
Forget what the computer says.....compare the fuel used against the mileage driven.

I haven't been all that concerned with the mileage I've been seeing so far because I expect it to improve with a little more miles on the clock, but I'm averaging about 22 mixed driving right now, per Imperial gallon. That's in the teens on a US gallon.
And FYI, in the past I 've always been able to get better mileage than the manufacturer's numbers on anything I've driven or owned, so it's not my right foot. When I say 22, that's nursing it. Dreadful mileage IMO.
Thankfully I buy gas in the US.

104

I just don't believe the 30+ claims unless it's a 5-10 mile trip t 60-70 behind other cars or trucks. I had the 2010 base coupe that got me a max, on just one trip of 200+ at 26.7 mpg, most other normal highway trips, I would get 24.5 mpg.

On my 2013 Sports package with 19 in., wheels, the best I could do was 23.8. At fast speeds of 80+, it's between 21 and 22.

I did 27-28 @ 75mph with cruise

Drove 1,431 miles and averaged mpg 26.7 using calculated mileage not the computer. Mostly interstate driving speeds running about 75 mph. A/C on a good portion of the way. In town 19 to 22 mpg depending on traffic. 40,000 miles on the vehicle. Six speed models have a 3.69 ratio rear end IMO the gas mileage is pretty good considering 332 hp.

OK
 

That's more like it.
If guys are realistically pulling around 26 mpg or thereabouts on US gallons, it puts Nissan's numbers about right at 32, 33-ish for an Imperial gallon. That was a number I figured I was able to live with before I bought my 370.
Now I just have to do all my driving in the U.S.

104

i average about 22mpg in my daily driving. havent went on a long trip to get a hwy mpg reading yet. i'm skeptical about the 30+mpg claims... it's a 370z not a prius.

Apparently there are a lot of people who get in the 370Z and dream that ey are in the Prius, drive in the slow lanes behind big SUV's and boast of their mileage.

Really impressive how these things can do 30+ on the highway. I haven't seen better then 28 on mine, however. For the guys getting 30+, are you hypermiling?

How off was the computer from your calculated? I've seen 28mpg on my computer didn't realize that would be off.

I routinely get 28-29 mpg cruising at 80 mph on cruise control (actual calculated mpg). I imagine 30+ would not be difficult if I drove 65-70 and didn't accelerate to close gaps. Definitely not hypermiling - if you are, you should be driving a different car.

So it appears EVERYONE is getting better than my 17 MPG on the highway. :(

My car just went in for the first service so all the tires have the right amount of nitrogen.

Not sure why I am not seeing good mileage like the rest of you. Any one have any ideas??

before 4.08 gears
I got about 21-22 combined
long highway drive, about 26-27

I don't understand how you're all seeing such good numbers. I average 18 on my daily commute, and get no more than 22, 23 on highway. And it's not like I'm always driving like I stole it

You're only going to see the 26+ on those long open highway cruises

I've done a 1300 mile trip and never saw over 23. Come to think of it tho, the car was loaded to the brim.. sounds like road trip time

What are your mods and how many miles?

Typical culprits are high-ish fuel trims (any CEL's?) due to either MAF or O2 misreads, which can be caused by air turbulence from vibrations or bends in the intake set-up, flagging or dirty sensors, vacuum (and exhaust) leaks, failing cats, etc.

FWIW, mostly city driving, tuned and LTH putting down around 310-315 whp, and I see a very consistent range of 19.2 to 19.5. I creep up on 20 - 21 or so with mixed highway driving, but lately I'm 95% stop-and-go.

However, I was briefly dropping to a pitiful 16-17 mph, and it turned out to be a bad heater circuit on the primary O2 causing it to not get up to proper warm-up temp.

my G only does about 15mpg on congested surface road commute so that's not too far off.

I don't have any mods. Car has about 3,700 miles

Just did a 371mile drive and got 24.4 mpg (calculated, not computer) with 4.08 gears. Some patches of traffic, but mostly clear 80+ mph

Hmm.

I say, fill up, use tripometer to calculate MPG on next fill up and take it from there.

You could have a failing O2 heater circuit and not get a CEL. A small break in the wire from a rock that flew up into the undercarriage can do it.

After that, all I can think of is over oiled filters if you have them, meaning you need to clean the MAF's or something really weird like a clogged cat.

Try confirming the MPG first and then we can go from there.

Any fluttering or low idle?

i as well want to test this out, I did a little 30 min highway trips from gf house and reset the trip and set cruise control it got up into 29.3mpg. car is brand new less than a thousand miles on it, stillen gen 3 intakes already installed. ill post my mileage this Monday when I do my 560 mile trip to home.

that trip mpg thing can be off... the sure way to test it is to fill up your tank. drive for how long you need to then fill up again and see how much gas you fill up with and see how many miles you drove and divide the mileage by the gallons you filled up with and you'll get your true mpg.

my mileage went down after i put the gen 3's in... like high teens-20's... to like... 15ish.

anyways... shouldn't this thread be locked now that gas is cheaper?

like almost 20 bucks cheaper for a half tank :O

you should be locked up cause you're $20 cheaper then last time :p :D

am i the only one that has no idea what my z's mpg is.

:hello:

And I don't care.

^ Because sports car.

and it's my weekend car. so idgaf what the mpg is lol

I drive it every day and I still DGAF. Especially with gas prices dropping like they have been recently. :driving:

Back in July, I took a road trip from Suwanee, GA to Hood River, OR and back. It was a total of 7,312 miles and I averaged 24.9 mpg.

seriously... when i drive i rev to atleast 4.5k in first and 2nd. fk it!

and when i want to have a bit of 'spirit' it's going above 6.

and then i like to hang the rpm high for a bit to listen to the music... in fact i down shift and sit in 2nd going through tunnels just because.

Now that's some :driving: Nice work :tup:

that's some driving right there. you should get a cdl :D

With full breather mods the computer is telling me 21.8mpg average. On the highway with no traffic and on straight sections the instant read will tell me around 30mpg (there's no readout for 30, it just sits between 20 and 40 and I assume it's a linear). This is the only way I figure people are saying they're getting 30 mpg.

The 21.8mpg is from almost ALL highway driving to and from work. If I drive any extended period in local traffic I'm down to about 19-20.

Filling up at the pump has shown these readings are fairly accurate. It's been a while but I THINK when I first purchased the car I was getting higher averages, but I believe it's normal to drop a few mpg when you put on breather mods. Higher air density needs more gas to balance it out to create more power and produce a more efficient explosion.

I average 27MPG. I travel 50 miles a day, 18 of those miles are mountain back roads going between 35-50MPH. The rest are highway miles with a few slight hills. The last check I did on the interstate, I averaged about 32-34MPG.