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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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#83 of 90
Re: POOR MPG [james27] by infinitim35
Aug 05, 2009 (3:47 pm)
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Replying to: james27 (Aug 05, 2009 3:31 pm)

Well I don't live in NYC where there is a lot of cabs. I live in brooklyn which is more regular streets. I don't really think it has to do with the car warming up because from time to time, I let the car warm up for 5 minutes before I drive and it is the same thing. I drove 10 miles before I reset my computer and I am still driving at around 10 mpg city. I was thinking about getting a fuel injection cleaning and switching to mobil 1 to see if it helps. My friends m35x is getting about 13-14 mpg city driving compare to mine 9-10mpg.
#84 of 90
Re: POOR MPG [infinitim35] by shmang
Aug 05, 2009 (4:04 pm)
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Replying to: infinitim35 (Aug 05, 2009 3:47 pm)

I believe your short trip is the key - if you let the car warm up (by not driving it), it just make your MPG looks worse, since it is calculated based on miles driven divided by gas used. When idling for warm up, you get zero MPG. I would let the engine warm up for 20-30 sec. at most and then drive moderately for a mile or so before go pass 3.5K rpm.
 
So, with your short trip and a lot of stop light, 10-13 MPG is not a surprise. I have a M45 and if I reset the trip computer at start up and drive the first 2 miles (45 MPH zone with basically no light), my MPG reading would be somewhere around 13, but since my commute is 22 miles one way, I normally get 17-18 without A/C and 15-17 with A/C.
 
So, short trip makes the car running at inefficient zone all the time - so it is not a surprise for your MPG. If you are driving a small I-4, this is not that noticeable, but for a big 6 (or 8), it is a very significant factor. Next time, reset your MPG calculation before hit a highway and run at least 15 miles and see what MPG you get. I will be surprised if it is not over 20.
#85 of 90
Re: POOR MPG [shmang] by infinitim35
Aug 05, 2009 (4:13 pm)
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Replying to: shmang (Aug 05, 2009 4:04 pm)

So should I even bother doing a fuel injection cleaning and switch to mobil 1 or live with the fact that my car will always average around 10mpg.
#86 of 90
Re: POOR MPG [infinitim35] by shmang
Aug 05, 2009 (5:58 pm)
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Replying to: infinitim35 (Aug 05, 2009 4:13 pm)

If for fuel economy purpose, I would not do either. But for better care of the car, mobile 1 sounds like a good choice, but you still need to change the oil every 7500 miles or 6 month which ever comes first - consider your short trip and stop & go traffic, which is very hard on the engine.
 
What;s more important is: make sure you run the car for at least 15 miles one way once a month (or more often) with a few good accelerations. This will clear up all the carbon build up in the engine caused by all those short trips.
#87 of 90
Re: POOR MPG [shmang] by infinitim35
Aug 05, 2009 (6:09 pm)
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Replying to: shmang (Aug 05, 2009 5:58 pm)

Isn't it when you get mobil 1 you don't have to change the oil as frequently? Thats what the mobil 1 extended performance claims to do?
#88 of 90
Re: POOR MPG [infinitim35] by nolic
Aug 06, 2009 (8:25 am)
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Replying to: infinitim35 (Aug 05, 2009 11:01 am)

Inflated tire pressure to 34 PSI on my 2008 M35 increased my average MPG (combine) to about 18 - 19 and I also used Mobil 1 synthetic oil (5W30).
#89 of 90
Re: POOR MPG [infinitim35] by shmang
Aug 06, 2009 (12:04 pm)
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Replying to: infinitim35 (Aug 05, 2009 6:09 pm)

Isn't it when you get mobil 1 you don't have to change the oil as frequently? Thats what the mobil 1 extended performance claims to do?
 
That is correct. But, with your driving style, I would change oil more frequently, since short trips are hard on the engine. So, with regular oil, I would do it every 3000 miles and with Mobile 1, you can extend it to about 7500 miles, but, still, I would NOT go way pass 6 month (7-8 month might be OK) though.
 
Yes, inflate the tire to 34 PSI will provide improved MPG - with some sacrifice of riding quality, not by much though.
#90 of 90
Re: POOR MPG [shmang] by carlosc52
Aug 07, 2009 (11:35 am)
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Replying to: shmang (Aug 06, 2009 12:04 pm)

I have owned an '06 M35 RWD since April '05 which currently has 82,500 miles on it. I live in South FL, commute 60 miles each way averaging 21.8 mpg running between 75-80 mph. My only complaint is the high RPM (3,000 80 MPH). Presume that the newer models with 7 sp tranny will help...

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