87 or 93 octane?

[eddiemcnally]

I take my '06' H2 to a chevy dealer. My mechanic is a former Hummer shop foreman. In Vegas the Hummer dealer shut down so that's why he works for chevy. He said to only put 87 octane and not to put 93 in and he seemed pretty sturn about it. That's awesome for the pocket. My question is if I put the power programmer in for 93 octane for the better gains, will I be hurting anything?

Thanx for your time, Eddie