Got a question for you L36 guys with an aftermarket PCM. What grade of fuel do you use? I'm curious if I have a knock problem from putting 87 in my car...

why use 87 when 89 costs the same?

Can we get a little more background? What makes you think you might have knock? Any actual numbers?

I have a custom from from Sinister Performance (GM Tuners) and I use 93 Sunoco

Why upgrade your car if you're not willing to put higher octane fuel in? The Intense PCM advances timing, 3 degrees if I remember, and some guys fight knock bone stock. Chances are, yeah, you're fighting knock. Only way to know is scan.

I don't actually KNOW I have a knock problem... I was just curious what people used. I'm gonna put 93 in there for now on

I've talked to Todd personally and asked him what octane I should run, he said 87 is perfectly fine and it'* what I've been running since I got the PCM back in August.

I tune mine personally, and i ALWAYS run 93 octane,(95 when available) in the '96.

87 should be OK, but if you are in doubt, switch to 89. 93 really shouldn't be neccessary unless you're having a tuning issue.
If you think you're getting knock, though, a scan would probably be a good idea.

its ten cents extra up here...