See my previous posts in this thread, I've already discussed and answered the OP's post in great detail. I know his situation had nothing to do with saving money. My issue above is solely with cts-v ls6, who is using 87 octane for the sole purpose of saving money as far as I can tell, and his opinion that everybody can use it all the time with no negative consequences, which as I said, is bullshit. Not to mention the ridiculousness of buying a $70k car just to reduce performance and potentially harm the engine in order to save $4 a tank on gas.
Read my posts on the first page to see my response to the OP.