What does everybody run for gas. Just got an 07 SL with 170k and I seem to remember reading that Nissan recommends premium unleaded. Is this accurate? Thoughts?

 

On a stock engine it won't really make any difference except higher octane reduces knocking and pinging.

 

Since it has probably always been run on regular fuel, you might as well just keep doing that. Also, since you have 170k on it, I doubt you would seen any real measurable benefit form running premium fuel in it. That slight advance in timing will all but pretty much be adsorbed by the looseness in a car with that many miles on it.

So, yeah, save yourself some money and put regular gas in it.

 

Here’s what your FSM says about fuel octane ratings and recommendations.

Use what you think is best, regardless of mileage.

 

Yes, premium is recommended for these cars(2008), but since fuel cost went up, I started using some regular.
So far, I've not noticed any drop off of power or MPG (27-28). I do on occasion mix the two octanes.