Welcome enjoy your G. I bought 05 G35x three week ago and I loved it. The only thing I don't like is gas mileage.

 

We don't have 93 in California. Only 91. I'd just run 93, it's probably cheaper for you than 91 is for me. You can mix if you want to try to create 91. Or just run the cheaper 87. I've run many tanks of both 87 and 91 through my car. It runs just fine on 87, don't notice the performance hit unless you're really pushing it, for just commuting it's pretty much the same. Might be a slight loss of mpg. You're probably only looking at a couple hundred bucks per year on the difference in regular and premium gas, anyway.

Enjoy the car!