Thanks all. Right now I have Eth free 89 octane in tank. It's the highest octane available in this area. No pinging. I'm thinking about going back to 93 and putting a little more timing in it since I'm getting away with 89. Already had feedback that people are running 10% eth with their TQ and no problems. If there's a over the counter parts store Eth conditioner that's actually effective I'll use it.