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Infiniti G35 Real World MPG

391 messages,  Last post on May 11, 2009 at 5:25 PM

You are in the Infiniti G35 Forum. Your Hosts are pat & karens

What is this discussion about? Infiniti G35, Fuel Efficiency (MPG)


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#369 of 391
Re: 800 miles during x-mas [sweendogy] by almatti
Jan 21, 2009 (7:43 pm)
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Replying to: sweendogy (Jan 12, 2009 6:36 pm)

I have a 2007 G35x, AUTO, 15k on the clock. NY area. My experience is about the same reported generally here. 14-15 City ( little better in the warmer weather, a little worse with the Winter Blend gas). Best Highway mileage which did go up by maybe .5 MPG with useage is 24.5 on a 250 mile trip at Mass -65-75 MPH, cruies control when possible. I have found that the of course, with the very cold temps lately, and "winter Blend" gas, MPG in the City at 13MPG, without really hard driving. I do like to use the DS mode though. But as others have said on this thread and other forums, You don't get the G for mileage. This baby is meant to be "driven". I've owned and driven a lot of cars over 38 years [including Daddy's 1966 Chevy Impala Supersport, & later a 1972 Oldsmobile Delta 88 [I must say that was a good car]- Fords, Nissans, Mitsubishi, Subbies, Pontiacs, plus many other rental cars to numerous to mention, etc], this G35X is without a doubt the best car I've had overall for driveability, performance, reliability, and pure driving pleasure.
#370 of 391
Unhappy Girl - I Should Have Bought a Honda by trinbago1
Jan 22, 2009 (5:05 am)
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I bought a 2008 GX and presently have a little over 300 miles on the car. I understand that the new factor and weather plays a role, but DAMN I am only getting about 12 MPG (if so much). I notice that I only get about 100 miles with 1/2 tank of gas.
 
My Jeep Grand Cherokee gave me better MPG...LOL.
#371 of 391
Re: Unhappy Girl - I Should Have Bought a Honda [trinbago1] by pscheid
Jan 22, 2009 (12:08 pm)
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Replying to: trinbago1 (Jan 22, 2009 5:05 am)

trinbago1,
 
It's an undiagnosed medical issue.......with your heavy right foot. Granted, the X is a few hundred pounds heavier than the Coupe, but you have to really be on it consistently to get as low as 12. Glad you are enjoying the car! And don't you just hate to see those gas prices relative to last August? Yahoo!
 
Jack
#372 of 391
Re: Unhappy Girl - I Should Have Bought a Honda [pscheid] by sweendogy
Jan 24, 2009 (1:15 pm)
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Replying to: pscheid (Jan 22, 2009 12:08 pm)

i'm getting 13 mpg on the current tank -150 miles - 90% city driving --and i'm not beating on the car.. the avg temp has been 20 degrees --car not a good city driver for mpgs add in the cold and the winter gas= even worse MPG's.
#373 of 391
Re: Unhappy Girl - I Should Have Bought a Honda [sweendogy] by paulo6
Jan 24, 2009 (2:57 pm)
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Replying to: sweendogy (Jan 24, 2009 1:15 pm)

Ive seen similar with my 08 G35xS and I live in Cold Michigan. My car has 4K miles now and already seen a significant improvement. I never expected the improvement to be that much with increase in miles.
#374 of 391
Re: Unhappy Girl - I Should Have Bought a Honda [sweendogy] by rhard49
Jan 25, 2009 (1:01 pm)
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Replying to: sweendogy (Jan 24, 2009 1:15 pm)

The sticker numbers are certainly misleading 1800miles I'm averaging 16.2 with about 50% highway driving. My V6 6 speed Honda coupe was about 3 tenths of a second slower to 60 but averaged 20 mpg even when I flogged the crap out of it. This thing is no where near the published EPA numbers and I thoiugh hesitation was worked out in all cars years ago.
#375 of 391
Re: Unhappy Girl - I Should Have Bought a Honda [rhard49] by sweendogy
Jan 25, 2009 (2:52 pm)
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Replying to: rhard49 (Jan 25, 2009 1:01 pm)

your accord must of been a newer 6 speed -- well your right city driving will not get much better the real improvement will be on the highway>
#376 of 391
Re: Unhappy Girl - I Should Have Bought a Honda [rhard49] by pscheid
Jan 26, 2009 (7:41 am)
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Replying to: rhard49 (Jan 25, 2009 1:01 pm)

I don't think folks have read this entire fuel mileage thread and figured out why their fuel mileage numbers are lower than others.
 
That .3 of a second Infinity advantage to 60 mph (one mentioned) compared to the Accord works out to 26.4 feet or nearly 9 yards! If you wanted economy, why didn't you stick with the Accord or better yet get a Civic? The Accord will not out handle the Infinity. Nor will it outbrake it. Here is what folks have contributed.
 
New car, tight.
Frigid outdoor temperatures.
Idling to warm up the car.
City driving.
Speed.....i.e., 75mph.
Winter blend gas.
What the car is and enjoying it.
 
There are a few web sites out there that actually have confirmed through testing that the best fuel mileage for most passenger cars is achieved between 45mph and 55mph. After that, as the speed increases linearly, the fuel mileage falls exponentially. Wind resistance.
 
Didn't you ever wonder why a 330hp G can hit 155mph WITH the speed limiter; yet a 500+hp Z06 Corvette with better aerodynamics can't go just 45mph more top end and hit 200mph? That is how severe wind resistance negatively affects a car. You can figure in fuel economy why you are at it.
 
At Christmas I rented a 2007 gasoline powered Chevy Tahoe, stuffed 5 people and luggage inside, and hit the cruise at 70 mph, got 20mpg out and back, 2,084 miles. Despite the gas formulation, winter temperatures, weather slow downs, and 7 potty/food stops for those with weak bladders. A stinking 6,000 gross vehicular weight Tahoe, weighed before passengers and luggage.
 
The folks that ARE getting the G's epa mileage figures didn't luck out and get an extraordinary car. Look in the mirror, read up on how to max your fuel economy, or simply pay attention to your right foot. Anyone can get the low mileage figures too, but we/they can also meet the city and highway epa numbers as well.
 
I have issued this suggestion before and NO One has responded. Go out on the highway. With the engine at operating temperature. When you reach the speed limit (55-65mph, whatever), hit cruise and reset the fuel mileage readout. Drive 100 miles of pure highway, unimpeded by traffic, tolls, and the related speeding up and slowing down. THEN report back your mileage to us.
 
Even in the dead cold of Winter and with the Winter gas formulation, a broken in G can get you 24 highway and 16-17 city. Eliminate the temperature lows and the reformulated Winter gas and you will probably achieve the epa highway figure with a broken in G.
 
Stop worrying about the fuel economy, or simply enjoy the car.
#377 of 391
Re: Unhappy Girl - I Should Have Bought a Honda [pscheid] by trinbago1
Jan 26, 2009 (8:40 am)
Reply

Replying to: pscheid (Jan 22, 2009 12:08 pm)

pscheid,
 
I guess my foot is a little heavy ...but how fast can I drive on Sunrise Highway (L.I. New York).
 
I'm driving to New England this weekend, so I will zero out the odometer and set the car on cruise control. I'll let you know the results. Thanks
#378 of 391
Re: Unhappy Girl - I Should Have Bought a Honda [trinbago1] by sweendogy
Jan 26, 2009 (5:22 pm)
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Replying to: trinbago1 (Jan 26, 2009 8:40 am)

I agree with pscheid-- but what he said HAS been mentioned on this channel before-- highway speeds -- even at 75mph with cruise engaged you can see 23-24 mpgs-- as mentioned before.
 
Trinbago-- i suggest if your making the trip up north--to do one thing-- take the merrit parkway (the navi will tell you to take 95n-dont listen to it) all the way up until you hit I 91 in CT-- the reason you should take this highway is to truly enjoy the G-- lots of turns at highway speeds -- you'll also get some sweet straightaways and there is always someone willing to match you on speed bursts. Once on 91 then hit cruise and you'll see the MPGS climb-- best of both worlds --
 
I filled up tonight-- 13.4 mpg for the tank --17.3 gallons to be exact before the stupid "warning light" went on. 20-17.3= 2.7 gallons left. All city driving as you probably guessed.

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