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Infiniti M35/M45 Real World MPG

97 messages,  Last post on Mar 12, 2010 at 10:14 AM

You are in the Infiniti M35/M45 Forum.

What is this discussion about? Infiniti M35, Infiniti M45, Fuel System, Sedan

Messages Page 10 of 10

#88 of 97 Re: POOR MPG [infinitim35] by nolic

Aug 06, 2009 (9:25 am)

Replying to: infinitim35 (Aug 05, 2009 12:01 pm)
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 97 Re: POOR MPG [infinitim35] by shmang

Aug 06, 2009 (1:04 pm)

Replying to: infinitim35 (Aug 05, 2009 7:09 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 97 Re: POOR MPG [shmang] by carlosc52

Aug 07, 2009 (12:35 pm)

Replying to: shmang (Aug 06, 2009 1:04 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...

#91 of 97 Decent Fuel mileage: '09 M35 on a recent road trip: 23.8 MPG! by m4m

Nov 27, 2009 (5:41 am)

Atlanta, GA to Orlando, FL: Trip Computer: 497 miles, Elapsed time: 7hr 19 min. for an average speed of: 75.3 MPH. Some luggage and about 1/2 way there and back A/C was on. LOTS of cops but they were all busy writing tickets. Still saw 90+ a couple times.
Speed limits vary from 55 to 70 with probably 70% of the trip at 70mph.
 
So, overall MPG for this trip, with an average speed of about 75MPH, turned out to be 23.8 MPG on premium. And I blew the doors off an Audi A6 and a GS350. Probably dropped my average by 1!

#92 of 97 Re: M45 gas mileage update [shmang] by mltsurger

Jan 15, 2010 (6:56 pm)

Replying to: shmang (Jan 11, 2009 7:23 pm)
I have a M45X with 20,300 miles at this time.I love driving it and try to drive responsibly,but the sound when punching it is great.I average 21 miles to the gallon.It recently has been very cold and am getting around 20.I always use B.P. white Premium.

#93 of 97 Re: Decent Fuel mileage: '09 M35 on a recent road trip: 23.8 MPG! [m4m] by mltsurger

Jan 15, 2010 (7:00 pm)

Replying to: m4m (Nov 27, 2009 5:41 am)
Sounds like a fun trip.How many gas stops? Has anyone ever gone over 140 mph with the infin.It is supposed to go 155.You really wonder about the handling at 140.If my driveway was longer I would like to try.

#94 of 97 What were they thinking... by james27

Jan 22, 2010 (3:42 pm)

As more details come out on the new M's, a couple just don't make sense to me: the new models get LESS fuel economy than the ones they replace, and, they have less headroom than the outgoing model. These are two areas that are a major concern for my new car search criteria. The M was near/at the top of the class in headroom, which is why I bought it. Decent gas mileage was a goal, but not crucial as long as I fit. Both parameters went in the wrong direction. So, it's search other platforms for my next car...they lost me as a customer. Next year's hybrid might improve part of that, but unlikely to recover the lost headroom.

#95 of 97 Re: Decent Fuel mileage: '09 M35 on a recent road trip: 23.8 MPG! [mltsurger] by dallasm35

Mar 11, 2010 (12:57 am)

Replying to: mltsurger (Jan 15, 2010 7:00 pm)
Yes I have got 2007 m35 up 160. It was flying.I strongly recommended you trying it out.

#96 of 97 What Gas You Use Does Make a Difference by smarty666

Mar 12, 2010 (8:49 am)

I know some people are going to say that this is phony baloney but I have personally found out that what gas you use does make sometimes a 4-5mpg difference in a car; I used to use Exxon and Hess 93 Octane in my 2010 Max Sv AND 2005 FX35 and was barely getting EPA on the sticker for mpg!
 
I got so fet up that I switched to Shell 93 Octane, after several family members and friends recommended it and after about 4-5 fillups with Shell I noticed a dramatic improvement in all mpg categories, city, highway, avg, etc!
 
Just a suggestion to help clean out your engines and get better fuel economy; if you don't have a Shell near you try using turkey hill or one of the other top tier gasoline companies!!

#97 of 97 Re: What Gas You Use Does Make a Difference [smarty666] by ghstudio

Mar 12, 2010 (10:14 am)

Replying to: smarty666 (Mar 12, 2010 8:49 am)
I'm going to try this. In the past I've found no difference between using regular and mid grade and premium....which suprised me. I'll give Shell premium a try.
 
One problem is that octane ratings aren't all equal....some measure a the bulk tank, some measure at the pump some probably measure in the lab. I always have this lingering concern because all the gas you see in those huge bulk tanks is regular and the higher octane is created by adding additives at the bulk plant or at the truck. Those additives cost money and they require a human to so something to add the additive. There is a cost incentive to maybe miss adding anything. I know, it's paranoia....but there really is no way to know what you a putting in your tank. Now when you use an off-brand, you are really taking your car's life into your own hands...because those stations have chosen to make more money by offering an off-brand....so maybe saving a little more is even better.
 
Darn...where is my shrink when I need him?

Messages Page 10 of 10

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