You will see no performance gains by using anything over 93 octane.

 

I don't know why people follow every thing in the manual like break in period, oil change, but when it comes to gas, they rather follow their own opinion. who know if its better or not, but I rather put premium in this car.

 

I find that interesting that Infiniti would recommend something that isn't readily available in Cali. Makes me kind of wonder is a motor actually engineered for 87/89/91/93/94 specifically? Or is it more marketing? BMW is aware of Cali. and they recommend 91. Mercedes made an official statement saying their motors can be run on regular as they sell cars in every part of the world, some places of which have no access to anything but regular.

I agree, as long as there is mention of premium in the owner's manual, better off using it. If no mention, then regular is fine.

 

The G35 motor is a high compression motor. Whenever you have a car with a high compression ratio or if its supercharged/turbocharged always put premium in it. Reason being is that any engine that has vast amounts of compressed air causes the combustion chamber to get really hot.

Using regular gasoline causes something called knock or detonation. This can destroy an engine but fortunately cars have knock sensors on them that pull back the timing of the sparks which also reduce performance. Premium gas burns slower than regular gas which means its less likely to prematurely explode in very hot compression chambers.

Its always best to use the lowest grade gasoline you can get that will cause 0 degrees of knock. Using a higher octane gasoline than necessary can actually reduce performance.

 

Before giving a sarcastic answer, maybe you should read the ENTIRE thread.
He is using midgrade, not super super premium.

 

god i love living in georgia...we get 93 everywhere you go

 

I didn't notice much difference when I put 89 Octane in my 07 loaner.

 

Can we just make a huge announcement at the top of every page saying the recommended fuel is 91 octane??? I'm seriously sick of these threads...

 

+1, the famous I'm too cheap to use the reccommeded fuel thread If people would only read their manuals and use search

 

+2

That's not likely to happen anytime soon.

 

Just put diseal in it, close thread.

 

One time I had an 07 loaner when I brought my 06 sedan in for service. When I first step on the gas, well it felt not much better than my 06 engine. I figured since it's a loaner so most people would just put in crappy regular gas. Thankfully the tank was near empty, so I put in as much super unlead as I could. After that the engine felt more powerful and the reving feels a lot smoother.
Anyway, just my 2cents.

 

Yup.

I always laugh when every once and a while you see some kid in a Civic putting in 93 octane thinking the "super" fuel will give you more power.

The higher the octane, the LESS combustible a fuel is. That is why it's required in high compression motors, to prevent knock and detonation (basically fuel exploding at the wrong time).

If the octane is too low, your computer reduces timing, which hurts fuel economy and power. If it's way too low, goodbye motor.