11.52 L/100km or 24.42mpg

based on 1500km with 4 filled ups. The mileages are combination of city and secondary hwy (with traffic lights). Semi spirited driving as it is still in break-in period.

 

Anyone notice a difference in the computer mpg vs. manual calculation? Also, altitude can be a big factor. My current vehicle gets about 18-19 mpg highway @ sea level, but I've gotten as much as 23 mpg @ 8000-10,000ft. The computer automatically leans it out-less 02 = less gas. Please post which tranny you have as well

 

Well, I now have just about 8000 miles on my G37S. Fully loaded with 6MT. I average high 19 to 22 mpg running in what I will call City driving. There are very few lights with some moderate hills. If the mpg is on the lower end of my scale the AC is on, upper end and the AC is off.

I have only really taken it on the interstate for one good trip - Nashville to Baton Rouge area w/ AC on the whole way. Started out running at 70mph for the full tank and got upper end of 24mpg. After filling up, I took her up to 80 and was getting about 22-23 mpg. Then I took it to 85 and it dropped to 21mpg.

In the beggining, I only used BP93. Then ethanol started to creep its way into the BP stations in Nashville area. I then moved to Exxon 93. Still getting about the same mileage. Recently started seeing ethanol at a few Exxon stations.

My last fill up was at a Kwik-Sak in LaVergne, TN. Their sign indicated "Our Gas contains no ethanol". They had 93 octane when no one else did in Nashville during the recent stint of NO GAS. Fortunately, I had a motorcycle and a V6 Firebird, both of which were full of gas. Anyway, with the Kwik-Sak gas in the car, I have used almost 3/4 tank and am getting an average of 22.8 mpg in the city, avoiding lights as much as possible.

XCLRATN
2008 Infiniti G37S 6MT Ivory Pearl, Fully Loaded w/ Illuminated Kickplates and LED Bulbs for interior and License Plate Lights

 

Two tank average yeilded 22mpg for driving by mostly my wife where daily speeds are 35-55mph with stop lights thrown in. This was a manual stubby-pencil calculation.

 

So the 2009's in general gained 2 mpg highway and the 6MT lost 1mpg highway??? How does the latter make sense? Did the 09's gain some chub on its already fat but sexy @$$??

 

You wouldn't like it out here in Cali, they have a lot of ethanol for the emissions, and very very few pump 93, all 91 out here. I think it's easier to get your hands on race fuel, than 93.

 

The mpg gain on the 2009 is likely due to the new seven speed auto tranny. Not sure why the 6MT lost mpg.

XCLRATN
2008 Infiniti G37S 6MT Ivory Pearl, Fully Loaded w/ Illuminated Kickplates and LED Bulbs for interior and License Plate Lights

 

Sucks you can't get any higher than 91 (unleaded).

My fear on ethanol is how corrosive it is. Not too worried about the G37, but I have some other older vehcles (98 Firebird, 90 Talon AWD (slightly modifed), and 99 Hayabusa) that may not be designed for ethanol use. Someone on the "hill" decided they wanted to force the ethanol issue and I have been hearing parts on some vehicles are being damaged.

XCLRATN
2008 Infiniti G37S 6MT Ivory Pearl, Fully Loaded w/ Illuminated Kickplates and LED Bulbs for interior and License Plate Lights

 

The 335i fuel pumps are extremely prone to ethanol damage. Lots of folks on the bmw forums had to get their fuel pumps replaced after less than 4-5k miles. Ethanol sucks!!

 

i load up with 98 octane and get around 14L/100km (SI FTW!!!) lol

 

I'm taking a long trip over Thanksgiving in the G. I'll be sure to watch and record my MPG over my total trip of 1500 miles.

 

interesting #s. i was making 18mpg hard city driving with up to 22mpg on long trips in my g35 coupe.

 

i get only 8.9 mpg...its probably my driving habits lol

 

sorry i just couldn't hold this in...i noticed you copied and pasted your signiture for all your posts

Go to "User CP", then click "Edit Signature", then copy and paste in there what you keep doing for every post and don't put it on the bottom of every post...makes it easier

 

^^^^ ahahahahahaha good catch