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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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#39 of 91
Re: M35 mileage [sfcharlie] by james27
Aug 12, 2006 (4:31 pm)
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Replying to: sfcharlie (Aug 12, 2006 1:36 pm)

I've averaged just under 20mpg with an M35x over about 8K miles at about the same percentage of highway/city mileage. You can go fast, but smooth makes a huge difference in minimizing the fuel. No sense in running up behind someone and then having to use the brakes - drive ahead as far as you can, and do it smoothly, and you'll be surprised how much difference it makes. I've hit 400 miles on a tank on a trip with a couple of gallons left when I filled up. From my experience, it comes out about a wash in mileage/cost to use premium vs regular...I get better mileage with premium.
#40 of 91
Re: M35 mileage [james27] by sfcharlie
Aug 12, 2006 (7:52 pm)
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Replying to: james27 (Aug 12, 2006 4:31 pm)

Two different reactions: (1) thanks for the tips and the upbeat attitude. (2) I'm at a support group for parents of handicapped engines.
 
Every single auto mag article comes in at 17 in mixed use. High percentage of people on this site say the same. Or read Edmunds consumer-reviews pros-and-cons for this car -- major "con" is poor mpg. It's not an illusion.
 
I don't want driving my car to be an olympic consciousness raising event in order to approach 20 mpg with a V-6 engine in mostly straight 60-65 mph driving.
 
Nonetheless, I have been so bothered by the mileage that (in addition to using premium) I don't rush around like an adolescent with his first car or even a person enthusiastic about driving. Smooth has become a religion. The car ain't converting, however.
#41 of 91
M35/M45 Gas Mileage by acerfan
Aug 15, 2006 (2:14 am)
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I am currently looking to buy/lease one of these. I have two questions; don't cars give better mileage after being driven a few thousand miles (my Accord did after about 10,000 miles), and, does anyone have the numbers for the M45? Thanks.
#42 of 91
Re: M35/M45 Gas Mileage [acerfan] by sfcharlie
Aug 15, 2006 (5:42 am)
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Replying to: acerfan (Aug 15, 2006 2:14 am)

From: http://auto.consumerguide.com/Auto/New/reviews/full/index.cfm/id/38536/Act/Showa- - - ll/
 
"Test M35 averaged 16.4 mpg in city/highway driving, test M35x averaged 17.4 with more highway use. Test M45s averaged 16.0 in city/highway driving, 18.8-19.1 mpg in mostly highway use."
 
Since I buy my cars new, I am comparing my first 3K miles with my M35 to similar experiences with other cars. I do expect the mpg to improve over time ... but ... I think much evidence has accumulated (in CR's evaluation, in reports from consumers on Edmunds, on this board, in many reviews, etc) to strongly suggest that V-6 engine/transmission gets poor mileage for a V-6. It has been widely recognized that the 5 gears and the gearing setup (designed to make this 275 HP engine, with torque of 270 4800 rpm) accelerate faster than competition in auto reviews) produce unusually poor mpg. The car is so loveable in other ways and MSRP'd so much lower than competition that, I believe, people who are smitten by it have a tendency to simply not believe that it has any negative characteristics.
#43 of 91
Re: M35/M45 Gas Mileage [sfcharlie] by antsinpants
Aug 15, 2006 (2:51 pm)
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Replying to: sfcharlie (Aug 15, 2006 5:42 am)

FYI - the manual states minimum 87 octane gas is required for the M35, not premium gas. Premium is suggested for increased performance on M35. I never noticed a difference, so I save my money and pump regular unleaded. Maybe the only way to notice a difference in engine performance is to drive it harder, and with a lead foot, but that would defeat the whole purpose of getting better mileage, right? Save your money and pump regular. My 2 cents.
 I think the M45 requires premium.
#44 of 91
Re: M35/M45 Gas Mileage [antsinpants] by james27
Aug 15, 2006 (3:20 pm)
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Replying to: antsinpants (Aug 15, 2006 2:51 pm)

You're right, the M35 allows use of regular, but they state that for full performance to use premium. I DO notice a difference. I also notice that I get better mileage with the premium, so the difference in actual cost per mile is about a wash.
 
The M45 REQUIRES premium. They also state that if you MUST put in regular because premium is not available, to not fill the tank, only put in enough to get safely to where you can get premium, then fill it up so you boost the octane as much as you can. They also say to not drive aggressivly while you have the regular in there.
#45 of 91
Re: M35/M45 Gas Mileage [antsinpants] by sfcharlie
Aug 15, 2006 (5:07 pm)
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Replying to: antsinpants (Aug 15, 2006 2:51 pm)

"FYI - the manual states minimum 87 octane gas is required for the M35, not premium gas. Premium is suggested for increased performance on M35."
 
Yes, I've been aware of that from before I bought the car. It was one factor predisposing me to choose the M35. However, like, James, I found that my mpg went down to 16 on regular, even though I've been so preoccupied with the mpg of this car that I have driven it with an obsessionally light foot, so much so that it begins to take the pleasure, for me, out of driving it. I have enjoyed, with other cars, driving a tank-full with total focus on higher-mpg driving, but I don't like being preoccupied with "Will this car ever get 20 mpg?" For example, over the weekend we drove early Saturday morning on a traffic-free route, all highway, for an overnight event, and back early Sunday in similar conditions. Steady 65 mph -- yet only got 19 mpg, for total 65 mph cruising, no city at all.
#46 of 91
Re: M35/M45 Gas Mileage [sfcharlie] by james27
Aug 15, 2006 (6:26 pm)
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Replying to: sfcharlie (Aug 15, 2006 5:07 pm)

What's your tire pressure? The alarms don't go off unless it gets fairly low. 36 all around isn't a bad number. At steady speeds it really does approach the epa ratings as long as you keep it under 80. On a long trip, the cruise control helps, too.
#47 of 91
Re: M35/M45 Gas Mileage [james27] by sfcharlie
Aug 15, 2006 (9:05 pm)
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Replying to: james27 (Aug 15, 2006 6:26 pm)

"What's your tire pressure?"
 
I keep a tire inflator in the trunk. I monitor the tire pressure every day on screen. I keep the cold pressure between 34 and 36. Do you think I should keep the cold tire pressure higher?
#48 of 91
Re: M35/M45 Gas Mileage [sfcharlie] by james27
Aug 16, 2006 (4:50 pm)
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Replying to: sfcharlie (Aug 15, 2006 9:05 pm)

That should be okay...are you at high altitude? That can make a difference in your performance and mileage. I guess I may be the exception...I usually get better mileage than average.

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