I have a 04 g35x sedan, which gas do i put in?

 

whatever the manual tells you, I put in Chevron 94

 

premium.....

 

Requires minimum 87. Recommends Premium.
In mountain states, the premium may be little more than 87

 

Premium is recommended, but medium is allowed.
This is a quote from the manual:

Sedan models
Use unleaded regular gasoline with an octane
rating of at least 87 AKI (Anti-Knock Index)
number (Research octane number 91).
For improved vehicle performance, INFINITI
recommends the use of unleaded premium
gasoline with an octane rating of at least 91
AKI number (Research octane number 96).

Enjoy your car!!

 

I have always put 91 or better in my car. It has higher than 10:1 compression, be good to it.

 

so basically 93 octane, if getting 91 might as well get 93.