What type of octane should I use on a GTP

[blueguy]

LOL

I ran 87 on a 3.1 pulley l26 bottom with no KR. AFR in the 10s at wot just like a canned tune.

I would suggest 87 for someone who just drives their Stock car. BUT if you want to drive it hard or think its a race car you should use 92.

Yeah, sounds like a great idea.