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Infiniti M35/M45 Real World MPG

91 messages,  Last post on Nov 27, 2009 at 4:41 AM

You are in the Infiniti M35/M45 Forum. Your Hosts are pat & karens

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


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#60 of 91
M35 base - manual mode by blueskies2
Jan 26, 2007 (11:46 pm)
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I have found that mileage is better if you use the manual shift mode. The D (automatic setting) always keeps the gear in position for maximum performance. For the best mileage, it is best to keep the car in 4th or 5th gear. Manual mode lets you select higher gears at the expense of acceleration (though it is still plenty of power for everyday driving).
 
And when you want the max performance you can manually select lower gears.
#61 of 91
M35x gas mileage by joegolfer1
Feb 08, 2007 (12:21 pm)
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I have an '06 M35x and I am getting 19 mpg. I have only checked gas mileage twice in 10,000 miles.
 
Prior car was a 2003 M45 and I got 20 mpg. Not unhappy but I did think my gas mileage would go up with the new one.
 
On another subject, the M45 was terrifying in the snow and M35x is a beast. Very happy.
#62 of 91
M45 gas mileage update by shmang
Jan 11, 2009 (6:23 pm)
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Replying to: joegolfer1 (Feb 08, 2007 12:21 pm)

All:
 
Are there any M45 owners (prefer over 1 year old, so it shows broke in gas mileage) that can share their gas mileage as well as the driving style and city/highway %.
 
I have a M45 and it seems that I basically get same city or highway, which is around 20 (say 18.5 city and 20.3 highway). Is this normal?
#63 of 91
Broken Streak by tayl0rd
Jan 12, 2009 (8:56 am)
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Dang! You couldn't wait until Feb 8 to ask that question? We were headed full-on into 2 years of nobody caring about the gas mileage of this car!
#64 of 91
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 91
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 91
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 91
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 91
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 91
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.

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