Yes you can.  Some people see better performance, but at the cost of more money.

on my gas door, it says PREMIUM REQUIRED.  on my road trip home from NC, i ran REGULAR for 2 1/2 tanks, roughly 700 miles or more.  The car ran fine, no knock reading or nuthin.  Now I am even boosted and when at 10psi, it had a little knock, like 15-20, but nothing worth worrying about so even PREMIUM REQUIRED cars can run regular.

It doesn't matter what the gas door says...my gas door says the same shit (2003 Spec). READ YOUR OWNERS MANUAL. In mine it says, under "FOR SPEC V" or something, to use gas with an octane rating of at least 87, but that at least 91 is recommended for best performance. So the sticker on the gas door isn't even true.

Ask yourself: does the Altima 2.5 require premium gas?

QuickSE-R wrote:

My car gets better milage using 91

Mine consistently achieves 2-3 mpg less on 91 or 93.

I know, it's really weird...but honestly it's such a small difference that I'm willing to just call it margin of error and say, I get about the same mileage.

maybe gas companies pay the car companies to put that "premium required" thing on the car. that way they get more profit off of consumers!

i use 91 octane i get better mileage and my car is more responsive too

armadnigeneral wrote:

It doesn't matter what the gas door says...my gas door says the same shit (2003 Spec). READ YOUR OWNERS MANUAL. In mine it says, under "FOR SPEC V" or something, to use gas with an octane rating of at least 87, but that at least 91 is recommended for best performance. So the sticker on the gas door isn't even true.

Ask yourself: does the Altima 2.5 require premium gas?

Also ask yourself: is our compression ratio higher to produce more power which would then suggest premium fuel for the engine not to ping? I believe the answer is yes, hence your manuel saying us AT LEAST 87 but a premium of 91 is recommended.