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Infiniti M35/M45 Real World MPG

90 messages,  Last post on Aug 07, 2009 at 11:35 AM

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What is this discussion about? Infiniti M35, Infiniti M45, Fuel System, Sedan


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#64 of 90
Not sure if it is a bad sign or not.... by shmang
Jan 12, 2009 (6:09 pm)
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Maybe all the M45 (and M35) owners are used to the terrible gas mileage and trying to forget about the pain? For now, the gas price is low, so no big deal, but it must be hurting back in late 2007 and majority of 2008.
 
I am used to the bad mileage already, but just feel it odd that I get almost the same gas mileage on city and highway - well a little over 1.5 MPG difference. This is not normal to me, thus the post/question.
 
Anyone mind share their experiences/thoughts?
#65 of 90
High revving engine by avj23
Jan 28, 2009 (8:35 pm)
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I have a new 2008 M35x with 500 miles on it that is getting about 10 MPG (mostly city) and revving high 2900 RPM's at 70 mph. It does not seem to go into overdrive. Has anyone else had this issue or do you think it will improve after some additional miles?
#66 of 90
Re: High revving engine [avj23] by shmang
Jan 29, 2009 (8:02 am)
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Replying to: avj23 (Jan 28, 2009 8:35 pm)

If it is at 2900rpm at 70mph, it is in overdrive. The M is geared for performance and you are already in the overdrive gear. Mine is the same (as well as other ones I test drove). On my Honda, it revs at 3550rpm in 5th gear at 70mph (again, sporty car and geared for performance).
 
Even for break in period, with AWD, 10MPG seems low. Unless it is very congested city and you have a lead foot and somewhat short trip (less than 10 miles each way). I get 15 when driving very aggressive in heavy city traffic and get 18 when take it easy.
#67 of 90
Re: High revving engine [shmang] by avj23
Jan 29, 2009 (4:47 pm)
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Replying to: shmang (Jan 29, 2009 8:02 am)

Been driving easy during the break-in period so it could get worse if I drive agressively. If the car truely revs at 2900 RPM's at 70 MPH, I think that would explain the gas mileage. In the last two days I've been in a Scion and Chevy Cobalt that were revving at under 2500 RPM's at 70 MPH.
#68 of 90
Re: High revving engine [avj23] by 150mphclub
Jan 29, 2009 (4:58 pm)
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Replying to: avj23 (Jan 29, 2009 4:47 pm)

My 2009 Cadillac CTS revs between 2100 & 2200 at 70. I guess that explains the Infiniti reputation for bad fuel mileage.
#69 of 90
Re: High revving engine [150mphclub] by shmang
Jan 29, 2009 (6:22 pm)
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Replying to: 150mphclub (Jan 29, 2009 4:58 pm)

Well, the high revs does not necessarily explain the bad gas mileage. Just as I said, my Honda revs higher and get 32 MPG on the highway (at 70MPH), which is a number the CTS can not reach. Not sure about the Scion or Cobalt though. But they are much lighter and has much less hp to begin with.
 
Infiniti could build a more efficient engine, but I think fuel economy is simply not their focus point.
#70 of 90
Re: High revving engine [150mphclub] by avj23
Jan 29, 2009 (6:55 pm)
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Replying to: 150mphclub (Jan 29, 2009 4:58 pm)

Is yours AWD? What kind of MPG are you getting and what kind of driving.
#71 of 90
Re: High revving engine [avj23] by 150mphclub
Jan 30, 2009 (4:09 pm)
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Replying to: avj23 (Jan 29, 2009 6:55 pm)

Automatic, RWD. 95% highway (usually about 75mph), 27 mpg.
#72 of 90
Re: High revving engine [avj23] by james27
Jan 30, 2009 (6:27 pm)
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Replying to: avj23 (Jan 28, 2009 8:35 pm)

I have a 2006 M35x. Mostly highway, it's about 20-miles to work, and I typically get around 20mpg, the best I've done is about 26. If I spend a lot of time in the city (not very often), it does drop to the mid-teens. I do drive fast, but don't put my foot into it that often. Definately not in the slow lane.
#73 of 90
Re: High revving engine [james27] by shmang
Jan 30, 2009 (7:09 pm)
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Replying to: james27 (Jan 30, 2009 6:27 pm)

Well, that sounds about right, except the 26MPG. I have never been able to get anywhere close to that - even when fuel economy is top priority. The best I got so far is 23.2 on highway 65mph, 70F, no A/C.
 
What did you do to get to around 26? I need to know in case the gas price goes to $4/gallon again

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