So I just realized the type of gas does matter

[Paperlantern]

See now i'm still learning things in this thread. Maybe I'll try 92 and see if I notice anything performance or mileage wise.

 

[Throckmorton]

This is why i was concerned with putting in 92 where the manual calls for 91. I did try putting 89 in it because i WAS concerned with putting higher octane than called for, and at least havent seen any difference power or behavior wise yet, but ive only ran about a quarter of a tank of it so far. Should I just say fuck it and go back to 87? Ive ran 87 for 6 years in it and the car has never been anything but smooth, I was just wanting to learn about this in case it would actually give me better mileage or performance.

The only reason it calls for 91 is that is the maximum in California. If they said you needed 92 or 93 like we get in other states, people in California would freak out--- which they should, because the state forces them to use a lower octane than recommended.

 

[zerocool84]

The only reason it calls for 91 is that is the maximum in California. If they said you needed 92 or 93 like we get in other states, people in California would freak out--- which they should, because the state forces them to use a lower octane than recommended.

The Mazdaspeed6 in the manual said that it runs best with 93 and it was known that 91 cause a very slight performance loss. It's not like anyone bought that car anyways.