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I know this seems like a stupid question but it's having me very confused.
When I first bought my car I thought it was supposed to use regular 87 octane, then I read somewhere that it's recommended to use midgrade 89.

But I just now checked the manual and it says to use "86 octane or higher".

So I'm very confused if I should be using regular or midgrade (or maybe even higher)?
I'm looking for the highest performance, not 'whatever will run for the cheapest' or 'minimum requirement' I want to use what will run best for the car.

I haven't found anywhere in the manual that says to use a specific octane, and only that octane.

If anyone else has the same car and knows the answer let me know.

- Paul

 
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use 87 its just a waste using a highter octane it does nothing

 
Rep Power: 812

my 2002 manual says use 87 octane for best performance. and the engine didnt change until 2006. the d17s are definately not hi compression motors so no need for any higher than 87.

 
Rep Power: 512

I agree with the above posts.. Only time I put anything more than 87 octane was when I had my turbo installed.

 
Rep Power: 248

Who can afford anything higher than 87 anyhow. I've used 87 since i bought my 03 and it's always ran fine.

 
Rep Power: 217

Lol. Some of us have no choice, really .

 
Rep Power: 512

You do drive a 00 Si, after all.. If you want, I'll trade you cars so you can use 87 octane.. haha