2014 370z Sport only 11 mpg
 

Hi guys, I am driving a 2014 370z Auto with Sport package, the car now has 1600 miles, I'm driving the car daily pure local with a lot of stops, I'm not pushing the car so hard, it usually shift around 3-4k rpm, shift at 7500 rpm for a couple times maybe. I just filled my tank yesterday and it was 13.082 gal and it ran 142.5 miles. so it has only 10.89 MPG...not even 11......I'm wondering if this is normal? should I drive to the dealer and ask them to check? Please advise:bowdown: thanks a lot.

i would try driving on hwy at 50-55mph constant for 10-20miles to see how the mpg is affected. if it still doesnt improve i would say take your car to the dealer.

chances are, you're a tad heavy foot and just enjoying your new car while the car is breaking in.

Not normal at all. I wouldn't go to the dealer just yet though. Give it a few more tanks so you can get an average.

have you been resetting your mpg at each refill? if not you will get a running total versus each tank mpg and that will be way off. plus if you do a bunch of city driving at low miles it will be low as well. go take a long drive on the highway like suggested.

Use the display for average fuel economy too. Compare that to what your tank fill technique is telling you.

I was driving like an old lady for the first 1200 miles, I thought only the first 1200 miles are the break in period? BTW, the computer says the average speed is like 16 mph, too slow?

1200 miles is the break in period, but the motor will continue to break in for some time. 16 mph average is very low. If all you do is drive in traffic, mpg will be low. Give it a few more tanks and keep track. It'll get better.

:icon18:

depends on how long you are idling for at stoplights, traffic, how heavy your foot is, your shifting patter as far as how long you linger in a gear at medium revs. That is actually how you should be calculating your mpg. I drove from palmdale, ca to las vegas, nv in Jan. I filled up and drove up hwy14 to the 15. I avg'd 28mpg up and 26.5 on the way back. Had I not drove around in Vegas I would have gotten approx 520miles on a tank and had almost half a tank left. Hope this puts it into perspective.

the 10.89 is not the number showed on the computer, it is mileage last tank / gas filled this time. the computer showed 15 mpg, but i never reset it since I bought the car. I just reset the MPG this time after I filled the tank, and now it shows 13.8 MPG / 14 MPH

It's probably a combination of things. You're driving in low gears at medium rpm, lots of stop and go, a new car breaking in, etc. Make sure your tires are inflated enough. Try shifting under 3k rpm.

This thread is a downer. Here I am just sitting here waiting for snow to melt so I can get the best 6mpg of my life while I try and get my fix before the next snowfall.

*shoulda bought a prius* lol.

:D

It does seem very low for stock though, something is not right. Can you hear any exhaust leaks perhaps?

I can hear tick tick tick sound after I park the car, is that the exhaust leaks noise?

No. That's not an exhaust leak if the car's not running.

Sounds like you're driving in NYC or any other big city. Frequent stop and go along with low speeds = terrible gas mileage.

So whats that noise? It is somewhere under the chassis I think. And how does an exhaust leak sound like?

I've had my roadster for 9 months now - and only average 11.9. But I sit in LA traffic and it takes me 30-60 minutes to go 6-7 miles. So I attribute it to that. My 2012 EX35 with 20's, my 2011 G37S Coupe with 19's, my 2011 Maxima with 19's, and my 2008 G35S sedan with 19's all did about the same. (Yes - Ive had a lot of Nissan cars lately).

Its the VQ engine and that fact that it's stop and go. But it's a great engine and when I do get on the freeway I get around 25-29 at 70.

The tick tick is normal for the VQ - should be very very faint. I've had it on all of them. Used to drive me nuts but I just gave up on thinking it was a problem.

That's just the noises a hot car makes when it's cooling down. In order for an exhaust leak to be happening, the car has to be running.

Case of lead foot

I'm in Houston, I drive like 4 miles from home to work and another 4 miles back every day...speed limit 30-35 mph...5 stops for 1 way...

manufacture list 18mpg, if im getting like 15-16, i wont complain...but 11...makes me want to know if something is wrong...

Is the car even getting up to temp? When it's cold the ECU adds fuel.

thats normal, expecially on new car. your mid pipe and or heat shield is making that noise from expansion contraction.

I personally believe shifting at 3k~4k is a bit high. And I'm willing to bet your foot is heavy on the pedal. You should shift under 3k with easier acceleration and throttle.

there you go. that's too short and speed too low.

take it out on a stretch on a weekend. you're going to prematurely kill the battery too unless you put a tender on it.
like my first post, drive 10-15miles at hwy speeds and see where you mpg goes. GL!

New car, 4 mile commute, the car never getting out of cold start enrichment, shifting at 4k. Honestly, 11 sounds about right.

I have done that for the first 1200 miles. if i shift under 3k, a corolla runs faster than me ...:eekdance:

Thanks~~I will give it a try:eekdance:

that's cause them corolla's are fast!

My friend is driving a new infinity qx70, we work at the same place and live in the same community, he is getting around 15mpg...><....same engine, but his car is way heavier than mine, why......

Why are you comparing two different vehicles? Are they geared the same? Are they tuned the same? Does he shift at 4k rpm?

I had driven a corolla before...it is not fast at all..><

hmmm...make sense...

The conditions you're describing are the worst possible combination for getting good gas mileage. Your commute isn't even long enough to get the car warmed up.

part of that post was a joke.

but the other part is that the corolla's first gear is geared pretty low for quick take offs.

and i know cause i made the mistake of owning one long time ago...well, i bought it for the wife to use, but anyway, i paid for it cash even.

if it makes you feel any better, my G35C gets about 13-15mpg on my daily commute. in bumper to bumper and low speed traffic, that's pretty normal for these cars. once i start hitting hwy then i can get about 18-20mpg. my Z gets about 19-22 average depnding on how i drive on the weekends (very light traffic)

I get 25 on avg out on the highway...in the town 12-14. but my car doesnt go much over 35mph on the way to work, lmao.

Can't wait to get my new DD 240sx this weekend!

:tup:

i have a dd myself. with me pounding on the gas, 29.5mpg. :D

oh yeah...93 240SX SE Hatch with 204,xxx miles. New extra long term DD and project car :)

sounds like fun :tup: be sure to post up picts in the other cars forum. :D



op- i think we figured out your root cause. :tup: any other q's?

It does make me feel better, lol. but, yea, I just want to make sure if there is anything wrong with my new car, so it sounds like it is normal, I will live with that :) I know a 370z is not for MPG. so at what RPM u guys usually shift while normal driving? below 3k?