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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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#2 of 91
GAS MILEAGE AND NOISE by firecapt
Jun 16, 2006 (9:28 am)
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Iam getting 18-19 in town and 24 plus on the road, When the car is closed up and air is on noise level is very minimal.I use mid-range gas and have a m35x.Iam Very Very happy with the car.I have had zero problems and the Nav is great.I would have liked the real time traffic but iam not going to trade to get it.
Stan
#3 of 91
MPG by sfcharlie
Jun 15, 2006 (10:06 pm)
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CR gives these figures for each car: "Overall mpg" and "MPG on 150 mile trip"
 
Audi A6 (V6): 21mpg and 25mpg
 
2006 GS300 sedan AWD V6: 20mpg and 23mpg
 
Infiniti M35x: 18mpg and 22mpg
#4 of 91
First M35 fill-up today by sfcharlie
Jun 16, 2006 (5:30 pm)
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The computerized mpg read-out was 16.2 mpg.
Caluclating actual mpg, from miles driven and gallons pumped to fill 'er up again, yielded 18mpg.
Driving was about 40% highway stop-and-go, 40% highway at 50 to 70 mph, and 20% city.
#5 of 91
M45 mpg by indemand
Jun 18, 2006 (3:54 am)
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On a trip the best I have done is a combined 20. In the city I get 14-16. Overall after 15K I have averaged a bit over 16. Had a lot of fun though!
#6 of 91
M45 MPG by purplem46
Jun 21, 2006 (5:43 am)
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My last 500 mile highway trip I averaged 24 mpg with cruise set to 72 and tire pressure at 35 all around. In town, I get about 14, but I have a heavy foot
#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.

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