Without knowing how aggressive our fuel / timing maps are in this car, it's hard to say. Most cars of this ilk aren't uber-aggressive and won't advance the timing much more than would be appropriate for 91 octane fuel. In some cars you can modify the ECU or have the car chipped and then select a "race gas" ECU program that WILL take advantage of race gas; but I don't know if products like the technosquared chip for our car have such programs, or if the "stock" technosquared program advances timing sufficiently to take advantage of race gas.

You might see a slight improvement but without knowing how the ECU is programmed, it's really hard to say. The my350Z forum might be a better place to ask; you're more likely to find someone on there who understands the ECU and/or find more companies who do chip work on this platform.

...Oh and as far as the octane booster, you should just send me $5 in the mail and forget about it. Those products don't really do anything.

 

Well if Pat Goss says so, then it MUST be true.

lamesag35, why not go by what your owner's manual recommends? There's a reason they recommend what they do.

 

When I get my G in a couple of days, I will check the owners manual and if it says 87 and recommends 91, I will get premium, if it says 87 with no other recommendation, I will also get premium as it is worth $100 or so a yr for piece of mind. I have always driven higher hp cars and I have never gotten anything other than premium gas. Maybe I am throwing my $ away, but I am not second guessing myself and that is worth something to me.

 

Hey, hey .... I got a can if BG 44K out of the deal. Don't dis my friend Pat

Also, my owners manual only recommends 91 octane for increased performance. Minimum acceptible octane for my vehicle is 87.

 

LMAO

 

How does elevation factor into the equation?

 

Higher elevations should mean lower gas mileage regardless of octane. The reason being that there's less oxygen in the atmosphere at higher altitudes and therefore the engine can't produce as much power.

 

Why wouldn't the octane level be the same number in all manuals?

 

FWIW, word is that all 2005s require 91 octane. The extra HP out of the engine for 2005.

I've noticed little difference in gas mileage and power on my 2004 sedan between 87 and 91. When the price difference is lower, I will use 91 on occasion, though normally I use 87.

 

I was using nothing but 93 octane in my 2003.5 5AT for over a year and a half until it hit over $2.70 a gallon. That's when I switched to 87 and I haven't noticed any real difference in the car's performance. Modern engines are fantastic pieces of engineering. I have a friend with an '05 G35X and he has been using 87 fairly regularly since he bought the car (with no complaints).

 

Yeah but has his mileage been different? I would not put anything in less than 89 since they recommend 91. Or does it say requires?

Also if you guys get one of those cash back master cards they will give you like up to 5% cash back for purchases at gas stations. Now there is a no brainer huh. charge your gas and get cash back knocks off about 10 cent a gallon.

 

That pinging is asynchronous combustion doing its best to knock a hole in the top of your piston(s). Also, pinging is not always audible to the human ear, and has to occur for the ECU to compenate, which is to say it's not instantaneous.

Cheapskate and driving a premium auto? C'mon now.

 

Cheapskates come in all shapes and sizes. I happen to be one that also appreciates a nice car like the G35X. There is nothing inconsistent with being a cheapskate and driving a nice car.

As evidence, I suggest a look at the cars at your local Costco. Perfect car appreciation/cheapskate harmony.

 

Predetonation will do nothing to the top of your piston. Severe pinging might cause your connecting rod to detach and possibly put a sizeable hole in your cylinder head.

On an engine as modern as the VQ35, the knock sensors will keep the engine from pinging. This is why the manual for the 5AT sedan states that 87 octane is OK.

Isn't it nice to be able to tell other people how to spend their hard-earned money

 

$29.40/280 miles=$0.105/mile
$32.2/322 miles=$0.10/mile
You save 1/2 cent per mile

Each time youi USE that performance, you LOSE the mileage gain advantage!