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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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#7 of 91
Second fill-up by sfcharlie
Jun 21, 2006 (6:53 pm)
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Combined highway and city = 17.3 mpg (using 89, not 91 gas)
#8 of 91
M35x MPG by zidecar
Jun 22, 2006 (9:15 am)
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My M now has ~8K miles. I do mostly local driving and have been fairly diligent about avoiding quick starts and keeping my top speed to 40 MPH or lower. Using regular fuel (87 octane) I have been averaging 20 MPG. It has been improving slowly over its life (picked it up in Aug '05). Initially I averaged about 16 MPG for the first 1K miles, but then I wasn't being diligent about limiting my speed - I preferred to vary it regularly to give the engine a decent "break-in".
 
On the few occasions that I have driven it on the highway for an extended period (> 1 hr), I have averaged 23 MPG at ~ 70 MPH. This was as of a few weeks ago. If I had the willpower to keep my speed in the 60-65 MPH range I believe it might even improve to 24 or more MPG.
 
This vehicle has been the most trouble-free of any that I have owned.
#9 of 91
Re: M35x MPG [zidecar] by sfcharlie
Jun 22, 2006 (11:01 am)
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Replying to: zidecar (Jun 22, 2006 9:15 am)

Does it bother you at all to be having to watch how your drive so closely in order to cope with M's bad mpg? It's led me to have some buyer's remorse about not having gone with Audi A6 which seems to get closer to 20, w/o all the carefulness.
#10 of 91
Re: M35x MPG [sfcharlie] by zidecar
Jun 23, 2006 (10:49 am)
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Replying to: sfcharlie (Jun 22, 2006 11:01 am)

Does it bother you at all to be having to watch how your drive so closely in order to cope with M's bad mpg? It's led me to have some buyer's remorse about not having gone with Audi A6 which seems to get closer to 20, w/o all the carefulness
 
I looked at the Audi A6 - it came in second on my list as well. I do not have any regrets or remorse in picking the M. I didn't like the MMI interface, its CD accessibility or its reliability record, but that doesn't mean there weren't things about the Audi that I miss (e.g., electronic emergency brake)...
 
As far as adapting my driving habits - yes, I had to think about it for a few weeks, especially since the M's throttle was a lot more responsive than on my previous car. Initially it was almost a personal challenge to see if I could voluntarily do it. After that, it more or less became a habit and I felt a sense of accomplishment that I could actually sustain it. That doesn't mean that I don't stomp the pedal every so often just to remember what its like!
#11 of 91
Re: M35x MPG [sfcharlie] by bw45sport
Jun 23, 2006 (10:52 am)
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Replying to: sfcharlie (Jun 22, 2006 11:01 am)

It's led me to have some buyer's remorse about not having gone with Audi A6 which seems to get closer to 20, w/o all the carefulness.
 
$400/yr difference in gas on a $40k+ car would cause buyer's remorse?
 
I drive an M45 Sport, have averaged a little over 17mpg through 10,000 miles, and wouldn't even dream of having an A6 for the $300 max it will cost me.
#12 of 91
Re: M35x MPG [bw45sport] by sfcharlie
Jun 23, 2006 (5:50 pm)
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Replying to: bw45sport (Jun 23, 2006 10:52 am)

Hmmm ... yes ... looks less relevant in $$ terms ... thanks.
 
Why so down on the A6?
#13 of 91
Re: M35x MPG [sfcharlie] by bw45sport
Jun 23, 2006 (11:45 pm)
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Replying to: sfcharlie (Jun 23, 2006 5:50 pm)

Why so down on the A6?
 
I really didn't mean to sound harsh regarding the A6. It's a wonderful car and one that would make anybody shopping in this segment, other than zealot BMW owners, very happy.
 
My only concern with the A6, which is a concern to me with all German makes right now, is reliability. I'm 2 for 2 with lousy BMW products and have been suffering through the worst automobile ordeal imaginable with a 2003 MB SL500. While Audi has made tremendous strides in improvement as it relates to reliability, mid to long term reliability still suffers when compared to Infiniti/Lexus.
Reliability is not my only consideration when choosing cars but it has moved up the list with my recent experiences.
 
While I agree that Infiniti's entire lineup would be better served by cars that were more fuel-efficient I merely wanted to point out that the financial side of the equation is often overstated.
 
BTW, I hope someday we will all be so blessed to appreciate the driving dynamics that only BMW can provide.
#14 of 91
Re: M35x MPG [bw45sport] - But by sfcharlie
Jun 24, 2006 (5:13 am)
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Replying to: bw45sport (Jun 23, 2006 10:52 am)

I was asking more about the part of your post in which, as others have suggested on the M35/M45 forum, you find yourself driving carefully to cope with low mpg of Infiniti. I find myself doing that, and I was asking if that gets annoying. It does, sometimes, for me, when I realize I'm doing that. Maybe you just mean you'd be driving any of the LPS cars that way and your post was not conveying the sense of your doing it is specific to this car.
#15 of 91
Re: M35x MPG [bw45sport] - reliability by sfcharlie
Jun 24, 2006 (5:20 am)
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Replying to: bw45sport (Jun 23, 2006 11:45 pm)

Yes, I that would outweigh mpg. Reading these posts and factoring in my own experience, the individual's history with German cars appears to make such a difference. As one person said on one of these forums, probably around vast majority of owners of all the LPS cars are happy with reliability (I owned a BMW 3-series for two years recently and never had it in the shop except for 15K service, so my perception of BMW is solid reliability) and it's a gamble with every car becaues none of them avoid "semi-lemons", but the Japanese have managed to lessen their "mistake-cars" enough to draw you, me, and others toward them. They usually also throw in better mpg and Nissan engines are an anomaly in that regard, don't you think? Although my automotive engineering expertise is not sufficient to fully explain it. It is only the gearing?
#16 of 91
M35 MPG Report by dmgoodman
Jun 24, 2006 (9:44 am)
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I am averaging 20.4 MPG (last three fill-ups)in a mix of 60% freeway and 40% suface streets (suburban) in my M35. Have about 2,000 miles on the car. Using Premium so far. "Reasonably aggressive" driving style.

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