So heres the situation. Running a slightly modified cobb OTS stage 2 map (for 91 oct). DAM is always at 16 and there is no knock present.
Filled up today on 92 octane premium, plus added a little octane booster to see how far i could push an economy map for kicks and giggles. (ive done this before, and no problems...)
Started it up and after driving around for about 15 minutes DAM sank to 12, and then to 8. This is all on the normal map, as i hadn't even loaded the economy map yet!!!! I was seeing all kinds of detonation.
This pisses me off. I know it was the gas. I called BP today and heres a direct quote:
BP agent: "sir if you would've gotten bad gas your car wouldn't have started."
Me: "wha....*confused* no i dont think you understand, the gas is good enough for me to drive, its just crappy low octane gas, and i thought you guys guaranteed the octane of your gas. I bet i have 87 sitting in my tank. "
BP agent: "again if you had problems with our gas you would need to get a repair shop to confirm that, and send a formal letter to us."
etc etc. So much for customer service eh? I'm gonna go load a more conservative map i guess.....