when I bought my car, the stupid mitsu dealer put in full tank of 87 octane gas in it. and guess what?
nothing happened. no knocking no fuel cut Nada! ran as good as 91 gas.
This is the reason why stock map is so rich!

 

i think more than one tank will start making your car run to the mechanic faster

 

the engine will detect knock and pull timing...

I set my check engine light on my eclipse gsx to flicker if it sees knock. One time I put texaco gas in there and it blinked like crazy. All the engine does is pull timing so you have little engine power output...

 

lower octane gas will just make your car more prone to knock under high boost/ high temp situations. If you're stock, with the sloppy rich stock map than you have nothing to worry about. If you are flashed and a lot leaner on the top end than I'd keep my foot out of it until you run the stuff down and can top it off with some rocket fuel.

There's a past thread about someone with a reflashed car that had 87 put in it and he utterly destroyed the engine due to detination.

YMMV,
Greg

 

So are you saying that everyone in california needs to start importing 93, or keeping gallons of 100 octane to add to our tanks to up the octane?
It says that 91 is fine, only that 93 is preferred. Or else everyone is california voids there warrenty on a daily basis.

 

knocking shouldn't be an issue unless your boosting more, you'll be fine. i did that in my '03 once, so i just kept it on low boost until half tank when i put 93 in

 

What about 87?

 

^thats pushing it, even stock

 

The manual states you can use even 87 if the others are not available. It didnt say anything about changing your driving habits. It did say that it could trip the CEL but that it should go off when you fill up with a higher octane fuel.

 

thank you for the vids. some of the best ive seen

silvery eagle

 

what about breaking in with, and always running 100 or 110 octane?????????? is that safe? its worse for your sensors right??

 

Higher octane fuels wont affect the sensors provided they are unleaded.

 

nuked my engine look at my sig for more info on that one... still fighting to get my money from the gas station.

 

My car runs like poo on 91. 93 is the only way to go...

 

shhhhh youll make all the californians jelious