Just so you know... the number of pistons a car has and the fact that they are configured in a V, Inline or boxer configuration makes no difference in the octane requirement. The main factor for the fuel octane recommendation is the compression ratio of the motor and whether or not it is using forced induction to increase that ratio during operational situations.

 

I think I'd be as concerned about depreciation when driving 35,000 miles/yr. Any interest in motorcycles? Cheap gas, cheap insurance, minimal depreciation relative to a car...tough to beat - especially if you live in a place like Texas where you can ride most of the year.

 

I use Shell, sometimes Chevron. Only top tier endorsed fuels for me, never bargain-basement with insufficient low standard additives/detergents.
True, but then different proprietary additives are added after that...or not.
These cars call for 'minimum' 91 not 91 written in stone.


MPG topic:
city/hwy/spirited
30%/65%/5%
~20-22mpg

 

I drive with a heavy foot. Mostly highway and I average 21mpg. Not to terrible.




+1. The car is just to much fun to worry about MPG. If you want a car with good fuel economy, then get a something else. This is the same reason I don't worry about tire consumption. There are pleny of 1.6l cars out there than do 40mpg. Or a Diesel...


BTW: N/e is the same amount of keystrokes as to just type Any. No offence. Just an observation as I was reading your post.

 

I'm planning on picking up a G35 coupe but ****, i didn't know these cars were that much of a gas killer.

 

It just depends on how you drive i drive decent monday-friday weekends i haul *** sometimes. When i am on the FWY ,i ususally drive 70mph on 6th gear and get 34 to 35mpg no lie on stillen exhaust,intake and ground kit i'lll post a pick from my navigation system,Remember not all have the same driving styles.On the streets is were i hurt abit with 23mpg..If you have a heavy foot take those weights off and drive less hard,Put 91octane as well cause if you add cheap gas it may cause a pre-eruption of the piston rings and you will need a new engine,That was said from my friend who is a tech at Nissan infiniti as well.Follow those recommendations for gas.

 

go fill up with 91. at a minimum. going lower octane will increase the chance of a "knock" or detonation event in the engine's bottom end

 

91+ octane is required since anything lower will cause engine knocking and misfire. So if you dont have 91 in your area, then 93 is the only thing you can use. Using 89 in order to save a few cent isn't worth it.

I get around 14-16MPG city driving. And i get around 18-20 highway driving at mostly 80 MPH. My MPG seems low because I got 9.5" front rims and 10.5" rear rims. And the tires are 245 fronts and 275 rears. So they are bigger compare to stock, they will stick to the road more => drop in MPG. Performance parts will also decrease MPG.

 

doesnt a CAI increase your mpg? or so ive heard...

 

false…. most of the time
it usually only gets you heat soak and loss in mpg…
in rare cases CAI can be well constructed but rare. stock with drop in filter is usually the way to go.

 

Well said... I was looking through the pages of this hoping someone posted something like this...

It's all compression... higher octane makes your gas more stable at higher pressures. Use 91 minimum. The engineers aren't stupid. They don’t put that on there for fun. Any higher grade will give you no benefits unless you are adding extra compression. It would be a waste of moneys.

 

Keyboard gangster hahahahaahahha

 

Sorry If this isnt the best place to post this but I searched and couldnt find an answer.

Here is my question. About six months ago I finally put a Z-tube and JWT intake on my 05 Sedan. The first few weeks my MPG went up to 24.3. I took it in to the dealer for its 100K work and since then my MPG has steadily gone down. I am not at 18.7. I reset the ECU about a month ago and the power is back but and I expected my MPG to go down a little but was hoping I would rebound a little to where I was. Could the Dealership do a little something to screw up my MPG since they boldly told me they didnt like the fact I changed the intake? BTW I now take my G to a different dealer... Thanks for any advice in advanced.

 

I get about 21 MPG (city and highway combined).

 

wow seriously.
Idk what it is but i get at least 24MPG every time i fill up.
I live in Northern DFW.
on a good tank without me doing any spirited driving i'll get 400 Miles at least.
an average tank it's 325-350 Miles.