We have a 2010 Vert (heavier than the sedan).
Wife drives it to/from work in heavy suburban traffic, lots of long lines at lights, lots of stop and go. Has always gotten about 18 mpg on the mileage tracker....last full tank burned clocked in at 18.2
We always reset the A/B tripometers and the calculated average is the same (18-19 mpg) as the on-board computer.
Haven't taken our new purchase on a road trip yet...but would hope it could get the same numbers I see here (25-28 would be great).

Final note...I do NOT have the very popular 19" wheel/tire package...but the 18" 5-spoke Grand Touring wheels. I might expect the larger/heavier wheels (with low profile rubber) to do a little less mpg?

 

I would say it's very normal, albeit it depends on season, route(city/high way), driving habit, performance modification.

Worse time, when driving with summer perfect tire, spirit fully, in city with lots of up / down hills, it went down to about 13.2 to me.

Best time, an almost all highway 300 mile road day trip, it gave me 23, never beyond 23, no matter how hard I tried.

Enjoy, forget about gas, it's a g.

 

I'm a coupe owner but would be hard pressed to ever do less than 15 in all city driving and I live in the Washington D.C. area (bad traffic). Of course if you sit and idle for most of a tankful, you could be expected to do worse, but how long can you sit there and creep along for for 200+ miles.? On the highway I can approach 27mpg at 65mph average.

 

Telcoman - when cruising on the highway, what speed have you found results in the best mileage? Your results are so much better than everyone else's I am essentially trying to clone your behavior on long trips

I drive back and forth to Newport Beach several times per month (over 70 miles each way), but 24mpg with cruise control is the best I've seen.

My car is brand new and pampered, so the maint. item discussions are not relevant.

 

Take the cruise control off and use your foot to maintain a reasonable pace. Cruise control works too hard to maintain speed up hills and does not take advantage of gravity going down hills. Of course in heavy traffic, you will have to use best judgement on how much you can vary speed.

 

Update:
Now that I have Stillen Gen 3 CAI and FI Exhaust I get around 19.5-20.5mpg but worth it

 

I've tried the no cruise control and it's not as effective unless I maintain say 55mph (I would get run over in CA driving this slow). At say 70-75, the car seems to stay in the powerband enough to minimize up and down shifting. What makes cruise control hard on the freeways here are the massive number of large trucks that travel the same north-south arteries. You essentially need to move between them on a frequent basis to avoid getting chips (from those dual rear wheels that act like a slingshot) all over the front end, so it sometimes negates the mileage from the cruise control being engaged.

 

I'm at 28k miles on my 2011 vert now. Around town I'm getting below 14, sometimes even in the 12's. I have a very heavy right foot.

One odd thing I noticed, having the top down for 600 miles didn't affect mileage more than 1-2mpg

I've done several long road trips (500-3000 miles) now and the best average I can get is 25.6. Mileage plummets once you go above 80mph, manually shifting into 7th and feathering the throttle still only gets 21-22.5 at best.

 

last fill up cycle I got 21.1 average (mixed driving) which is ok. That was probably 240+ miles to half a tank...not bad. I use cruise control most of the time cuz I don't like to watch my speed. If I am doing it, the car is so quiet and smooth, I'll be running around 80 and not know it. That could be a serious problem for me.

 

1- I have a 50 mile drive to work (100 mi round trip per day) in the early morning hours with no traffic. NJ Turnpike and Garden State Parkway at 65 to 75 MPH

2- I found that I get better mileage using regular 87 octane

3- I read a post a year or so ago the using cruise control reduces MPG by 1 to 2 MPG

4- I found that to be true and never use cruise control anymore.

5- Temperature and humidity also affects MPG by 1 to 2 MPG

6- I use conventional 5W-30 oil and change it every 3 to 4k miles. I change air filters every 8 to 10k miles and the cabin filter once a year

7- Between my 06 G35 6 speed and my present 2012 G37S 6 speed I have driven my two Infiniti's over 200k miles and found what I wrote above to be absolutely true.

Good luck

Cheers

Telcoman

 

how long have you been using 87 gas ? is the vert require premium 93 gas only ?

 

Lower octane = better MPG. This kinda makes sense because the knock sensors will retard the timing to compensate, thus requiring less fuel during the combustion cycle. Less power is the tradeoff, but who cares if you're commuting most of the time. Since I work just three miles from work and there are 9 traffic lights between home and the office, sub 20mpg may be a way of life for a while. I will have to try turning off cruise control the next time I drive up to OC to see if there is a change.

 

I still am not putting anything lower than recommended. The MPG saved from lower octane just isnt worth it in my book

 

Well if I take the roughly 200,000 miles that I have driven my two Infiniti's since December 2005 and divide by an average 23 MPG using regular 87 Octane I have used roughly 8695.65 gallons of gasoline.
Multiply that by a conservative $.30/ gallon more that is charged for premium that saving comes to over $2600.00 saved.



The savings are worth it to me.

Telcoman

 

A couple of comments:

- I notice a significant difference when it is really cold - at least 1 mpg less. Presumably due to running a richer A/F ratio.
- I disagree with the statement that retarding timing improves fuel economy. Generally the best economy and performance you are going to get is to have the timing advanced just to the point of incipient detonation. Typically if the compression ratio is high enough that the timing is being retarded on regular, then running premium should give some minor MPG improvement. If not then the premium might be slight worse mileage due to the additive package and process to increase the octane.

Interesting - the G37 officially "requires" premium where it is only "recommended" for the Q50.