What's your average MPG for your 370z?

scruffydog

So, I've had my 370z Sports + Touring + NAV, 6MT for a month now, and I've been getting some pretty ridiculous MPG since. I've been driving 3/4 city and 1/4 Hwy and I always leave the A/C on.

For the first 500 miles, I've been shifting before 3000-3500 RPM. And the AVG MPG registered at 15.9.
Then for the next 500 miles, same case, but I would shift in the range of 3000-4000 RPM and it's starting to pick up to 16.5 MPG.

Finally, after broken in my car at 1200 miles, I would shift within the range of 3000-4500 RPM and the best I got was 17.4 MPG.

I would turn off the A/C and it wouldn't make any difference with the MPG, I'd drive 1/2 Hwy and 1/2 city and it's still 17.4 MPG. My AVG speed is 26 mph.

The MPG rated for this car is 18 city and 26 for hwy. To be honest, I was expecting this car to be in the middle of the 2 MPG. Somewhere around 20-22 MPG, but it seems like I'm not even close.

Sure I understand, I'm driving a Manual transmission so I'm not gonna get as good of a fuel economy as an Automatic transmission considering they tweak these AT parameters optimize to be as fuel efficient as possible. Also, I have the A/C on all the time.

But here's another comparison, my other car is a 2007 Lexus IS250 AT. It's rated at 21 city and 29 hwy. And I've been also leaving the A/C on always, similar amt of city and hwy driving, but I'd always get around 25 MPG (right between the two rated MPG. How's that the case? Is it really because AT is THAT efficient? Or is it because it's a Toyota/Lexus? Or is it the way I drive?

And if it's the way I drive (and I consider myself driving really easy on the throttle most of the time), what's the best MPG are you guys getting on your 370z?

Jeffblue

is250=2.5 liter engine, 370z=3.70 liter engine. my altima coupe has a 2.5 liter engine, gets about 25 mpg on average as well. bigger engine, less MPG, all things being equal.

scruffydog

true to that, but I would think there's a reason why they have a rating for a baseline comparison because fuel efficiency can vary by a lot even with the same/similar size engine capacity. I doubt Lexus IS350 is way off from their rating. It'll still be in the avg of the 2 CTY & HWY rating.

Then there's a debate about it being a sports car and the other one isn't. But both outputs similar HP. I'm just more interested in how well, if at best I'd ever be able to even get the MPG of over 20 for my car as it is rated at 26MPG for max on HWY only. I'm not being naive because I know those ratings aren't ever reachable because those tests are setup differently than our daily driving. But 15.9 MPG? 17.4 MPG? that's just not even close...

waaaasabi

My average is around 18.X but it's almost all city driving.
And because its all city driving, my average MPH is somewhere around 16.X...
Pretty sure the A/C is affecting your MPG; not sure why it didn't go back up when you turned it off though. Are you doing the MPG calculations by the on-board computer or other means (i.e. tracking usage through gas receipts)?

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370Zsteve

18.8 mpg

25 Hwy

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shadoquad

It varies widely based on how I'm driving her, and I also have a 6-spd manual. When I test drove a Z and was really playing with it, cranking the engine and whatnot, I was getting 14mpg. In my first week with the one I bought, I drove it very gently but only around city neighborhoods. I was hitting roughly 17-18. I took it to PA this past weekend and was driving mostly in 6th gear and above 65 mph, and I averaged over 21mpg. I didn't vote in the poll above, because my answer is multiple.

DjSquall

16-20 liters/100km which is 15-12 MPG. I do a lot of city driving and take off as fast as I can within legal limits.

wishihadnav

17ish

scruffydog

yea, i would think the A/C at max affects me 0.5-1 MPG. Right now i'm tracking it with both the on dash computer and the one on the NAV. Sometimes it varies by ~0.4 MPG but right now it's locked on 17.4 MPG as the best.

I would also track it by the number of gallons since last fill up and the amt of miles I can drive before i reach to about the same point. It's usually around 320 miles max for 17 gallons.

My buddies' 2007 Corvette get's 19 MPG and that's a V8 much bigger engine. More reason as to why I'm concerned. I should at least get 20 MPG.

shadoquad

Vette engines are ridiculously efficient. I wouldn't worry about that. The current Z06 was the first production road car to achieve 500hp and have a high enough mileage to avoid the U.S.'s "gas guzzler" tax.

6spd

i get anywhere from 21-24, and im not the easiest driver by any stretch. i couldnt imagine what it'd take to get 18, ouch... i'd say im about 70/30 city/HW.

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scruffydog

whoa....really? AWESOME!!!! I can live with those numbers!

Is that what it says on your computer meter? If not, what does it register as? MPG/MPH

terbo

I believe my computer monitor reads 19.8ish MPG. Doing the math for the past few tanks, I have gotten on average 21.5 mpg, highest being 22. When I first bought the car I was getting around 17 or 18mpg, as I've owned it it's only increased, which is to be expected as everything is broken in.

scruffydog

That's really good news! Mine's been the same way too, it's been increasing since I got the car, but mine plateau at 17.4 MPG, hopefully it'll keep climbing...

I normally wouldn't complain but gas is getting more and more expensive. My excuse to myself to drive this car over my 1994 Honda Accord EX is because I like to think it's a much newer, more efficient so I'd save more money in gas - but that's not even true anymore because I only need to put the lowest grade fuel in my Honda Accord and with this car I have to put Premium. Even if the 370z get more miles per gallon the cost per gallon ends up cancelling out the extra miles I can get on top of my Honda Accord (which I like to make believe is a much less fuel efficient car) Sadly, Honda's are known to be super great cars for not breaking down and have super good fuel economy.

Soygen

I've put 600 miles on mine and my computer is reading 16.9 mpg. The vast majority of those 600 miles have been to work in rush hour, though the traffic isn't too heavy on my commute. I could probably shift earlier and get a couple more mpg.