i don't know if my question will be still relevant to the topic.
I have been using 91 since i got my car. since the prices of gas went down a bit. i want to use 94 , does that really make difference in terms of performance and consumption on paper?

second should i fill it up when the tank is almost empty or i can put even on a half full tank?

the reason i dont have any info here in canada is, in europe we always use 100 or 97.but its 3 dollars a litre (( so what octane does infiniti suggest 94?

thanks in advance and sorry if it is off topic.

 

You are wasting your money on 94, it will not make any improvement in mileage and any gain in performance is very minimal. Infiniti recommends the use of 91.
In our colder climates, especially during winter months it is best to keep the tank topped up. This will help to keep condensation out of your tank which can cause further problems.

 

Musti - I used Sunoco Ultra94 for about the the first 9 months I've had my G and recently I switched to 91. After 3 months on 91 there has been no noticeable difference in mileage or performance.