- #74 of 90
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Re: High revving engine [shmang]
by james27
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Jan 30, 2009 (9:52 pm)
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Replying to: shmang (Jan 30, 2009 7:09 pm)
200 miles on cruise control with gas that didn't have any ethanol in it, cool, but not super cold, level roads, no traffic. Per volume, alcohol doesn't have as much energy as gasoline and lowers your mileage. Hard to find depending on the locale and the season, but does make a difference. It helps if you run the tires at the high end of the recommended range as well.
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- #75 of 90
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Re: High revving engine [james27]
by palincal
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Feb 04, 2009 (8:49 pm)
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Replying to: james27 (Jan 30, 2009 9:52 pm)
2900 RPM at 70mph is normal for an M35. It is designed to rev high for sportiness. Check you trip computer for you av. speed. I get 19.5 MPG for an av. speed of 30mph. Keep you tires at 34-35 PSI. Use premium gas from a quality brand. Keep the windows up will driving above 40mph. If nothing works you have a problem. 10 MPG is too low even for a new car.
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- #76 of 90
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Re: High revving engine [palincal]
by AboutTreeFiddy
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Feb 15, 2009 (3:09 pm)
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Replying to: palincal (Feb 04, 2009 8:49 pm)
Note the 2009 M35 RWD with the new 7 speed trans has higher top gear. I'm seeing exactly 2000 rpm  60mph which would put it at about 2350 70mph (I'll check it 70 next time I'm out). My first half tank was 23 mpg (computer) with probably 70% highway, 25% suburban & 5% stop and go (easy driving during break-in).
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- #77 of 90
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Re: High revving engine [palincal]
by avj23
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Feb 16, 2009 (7:38 am)
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Replying to: palincal (Feb 04, 2009 8:49 pm)
Have just over 800 miles on the car now and still averaging at best 12 mpg almost all city/short trips. Took it in to the dealer and they said its fine, "it should improve slightly after break-in period." Wish I would've checked this site first might not have bought it. Nice car though.
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- #78 of 90
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Re: High revving engine [avj23]
by james27
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Feb 16, 2009 (3:57 pm)
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Replying to: avj23 (Feb 16, 2009 7:38 am)
Short trips, cold starts, stop and go will always be a problem with a high-performance car, especially one weighing about two-tons. You might want to use the trip computer and see what your average mph and distance traveled is...my guess is the car might not be fully warmed up and you spend more time idling than you think. A diesel works much better, since it is very efficient at idle.
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- #79 of 90
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POOR MPG
by infinitim35
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Aug 05, 2009 (11:01 am)
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I have an used infiniti m35 sport 2006. It currently have 67k miles and I have been suffering terrible mpg driving here in nyc. My city driving at best is around 10.5 mpg. My combine city/highway is around 16mpg. Anyone know what is wrong with my car? Is this normal for nyc driving? It is not even heavy traffic where I live. I bought this car to the dealer and they told me this is normal.
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- #80 of 90
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Re: POOR MPG [infinitim35]
by shmang
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Aug 05, 2009 (2:03 pm)
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Replying to: infinitim35 (Aug 05, 2009 11:01 am)
What is your daily commute distance (each trip)? When you say city, was that like a stop light every quarter mile to half mile? What is the % for your combined drive, like 40% highway, 60% city?
Keep in mind, the M is very thirsty to begin with.
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- #81 of 90
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Re: POOR MPG [shmang]
by infinitim35
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Aug 05, 2009 (2:28 pm)
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Replying to: shmang (Aug 05, 2009 2:03 pm)
I commute about 5 miles round trip. City driving as like stop light every block or every two blocks. It's not like one block the light will be green and the next block is red. It is consistent most of the time so I don't have to stop until like 5 blocks. My combine driving is about 30% highway and 70% city. Is this normal to get 10mpg? sometimes even 9mpg? I thought my fuel injector was dirty or something since it was a used car but I add some additive and it still didn't help much.
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- #82 of 90
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Re: POOR MPG [infinitim35]
by james27
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Aug 05, 2009 (3:31 pm)
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Replying to: infinitim35 (Aug 05, 2009 2:28 pm)
In 2.5 miles (your one-way trip distance?), the car is not warmed up. Yes, the temp gauge will say it is, but it takes longer than that to fully warm up everything. In that time, the car will be using more gas. You're just getting to the point where it can start to hit its peak when you shut it off.
I have a 2006 M35x and my average tank mileage is about 20-21mpg, but I travel 19-miles, mostly highway each way to work. My mileage went up a little (maybe around 1mpg) when I switched to synthetic oil. I've had the oil tested periodically, and can safely run about 10k miles between oil and filter changes. You probably wouldn't want to do that with all of those short trips.
In NYC you might get run over by the cabbies if you don't accellerate fairly quickly, but it can make a huge difference if you take it a little easier, and don't brake late when you see the light is red ahead of you.
I'm seriously considering a new Mercedes E-class diesel. It should be great in short trips and on the highway (rated at 32mpg highway).
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- #83 of 90
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Re: POOR MPG [james27]
by infinitim35
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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.
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