I don't really have an interest in running 93 due to cost (~.60 cents/gallon more). I drive about 1,500 miles/month so it adds up. Being E85 converted I can run it whenever I want the power gains.
There's a lot of rhetoric out there about 87 octane. Some fact some fiction. Yes these Gen 5 LT engines have high compression but they are also direct injected which I believe helps a lot with keeping combustion chamber temps down. I've done quite a bit of data logging on my truck (L86/8L90) and I don't see dangerous amounts of KR. In fact, I don't see much at all. It makes me think I'm missing something,...
So how many of you run 87 on your Gen 5? In the KR trouble areas is there anything that can be done besides reducing timing? SOI? Cam retard - for EGR effect?