Ive been paying $2.50 here in santa barbara for premium. Thats the cheapest in town, its been $2.75 at some places, and its $2.99 for full serve.

2004 Sedan
Black/Willow
Premium w/ splash guards
Clear Corners, Z-tube
*On the way*
-Stillen CAI
-Drilled Aluminum Pedals
-Hotchkis sport sway bars

 

prices went down a little here in indy to $2.19 for premium (shell or bp). and wow, we don't even have full serve, not that i want an attendant touching my car. but, anyway, i'm expecting the prices to jump when the indy 500 and F1 come around.

<font color=purple>.g35girl.</font color=purple>

 

Augie.......Mad Max! LMAO!!! [img]/w3timages/icons/smile.gif[/img]

Ive been paying around $2.43 for premium. Dont think ill switch to lower octane anytime soon.

I will be the one at the gas station shaking my head as I see the dollars rollin upward! "WTF!? $2.43!?" [img]/w3timages/icons/mad.gif[/img]

G35papa
2003 Pearl White - Premium Willow - Clear Corners (moded) - Z-tube - 18" OEMs- Tinted all around

 

Just imagine that you were successful in wounding the oil
companies. Suppose you hurt them so bad that they would
not be able to supply your local gas stations with any fuel.
Isn't that like shooting yourself in the foot or pissing directly
into a high wind?

2003 TwBlue 5AT Sedan, sunroof,
Graphite Leather, splashguards, HKS exhaust,
14 wire Grounding kit, 350Z duct, Stillen CAI
Underbody rear diffusers, Drilled alum pedals

 

I know every little bit helps BUT...assuming that 87 octane is ten cents less/gal. than 93 (like it is everywhere here in Austin) and the average fill up is around 17 gallons...that is only $1.70. saved. I am going to do a test and run with 87 but if I notice even the littlest bit of change it's back to 93!

Obsidian/Graphite; Premium Pkg; Aero Kit; Suspension Kit; Nav Sys; Sunroof; Clear side markers, K&N, Z tube. Next...GroundingGear

 

I ran 1/2 a tank of medium octane and noticed no difference at
all. But since I still can afford the Super grade, I still use it.

2003 TwBlue 5AT Sedan, sunroof,
Graphite Leather, splashguards, HKS exhaust,
14 wire Grounding kit, 350Z duct, Stillen CAI
Underbody rear diffusers, Drilled alum pedals

 

If there were only 10 cents a Lb. difference between steak and hamburger - would you eat the burger?

This is our "G"s we're feeding here, man (LOL).

Sport Sedan Fan - 2004 6MT Sedan
Sport/Navigation/Premium/Aero
Obsidian Black/Graphite & "Titanium"
SHE'S SILVER & BLACK - GO RAIDERS!

 

never heard of a burger that weighs a pound.. but interesting.

Pictures...

 

Nations burgers.....but I think most of the weight is all the mayonaise they use!!!!

ALSO......I paid $2.49 a gallon today! WTF?! I just paid $2.43 the other day!



G35papa
2003 Pearl White - Premium Willow - Clear Corners (moded) - Z-tube - 18" OEMs- Tinted all around

 

you know what i think....if we use regular..thats about 20 cents cheaper per gallon...thats about...3 dollars we save every fill up's....thats like..20 bucks a month....240 dollars a year.....yes...maybe its not good for the engine...but it probably not gonna break down in a year ...especially when you have warranty...at the end...even if you have to fix your car in like..6 years...doesn't that still save you money...not to mention even if you use premium gas...you probably still ahve to maintain your car somehow? ...just a thought....

 

If you want to do the math, you should also consider that you get reduced fuel economy with regular. Let's say you drive 15,000 miles per year and average 18mpg. That's 833.3 gallons of gas. Now you switch to 87 and get 17.5mpg (just to pull a number at random). That's 857.1 gallons. 23.8 gallons more. Now, let's take a number somewhere in the middle between SoCal and the East Coast, and say $2.00 for 87 and $2.20 for premium (91, 93, I don't care).

833.3 * 2.20 = $1832.82
857.1 * 2.00 = $1714.20

A difference of less than $120 a year, about half of your estimate.

It varies depending on how much you drive a year, how much gas costs in your area, and how much of an impact on fuel efficiency the 87 has on your car and driving style. You'll have to run your own numbers. In some cases the 87 may actually be more expensive at the end of the year.

I've been running 87 for several months now, as an experiment to see how it affects the car. It's hard to tell if there's much of an effect on mileage on my car, though, as this beast varies up and down from 15 to 18mpg all the time, anyway.

 

ya...i was thinking that...but no one ever can prove how much (or if any) difference in gas milage between different octane's......so...i didn't put that in consideration...even 120 bucks a year can mean something...

 

If anyone can find out the Compression Ratio of the G35s engines that way you can see the difference with a regular engine which typically uses 8 to 1 ratio. As you go higher than 8, you will need a higher octane that can handle the compression effect better.

I checked infiniti.com, manual and brochure but couldn't find the compression ratio.

I think it's safter to fill up with premium, if you plan to keep the car for a while. If it's a lease, save your money and pump regular.

Someone saif the ECU would lock in to the regular setting after a while, where did you get this from?! Everytime you turn on your engine it's a brand new day for the knock sensors! The instant the lower or higher octane gas reaches the sensors they will adjust the timing seamlessly.

 

Pull up Infiniti's website, click on G35 Sedan (or Coupe), then click on Specifications.

Mechanical

Compression Ratio 10.3:1

 

aww :-) I was on Infiniti Canada's site. Well then, I think it's pretty clear that using the 91 is wiser if you care to keep your car running smooth.