The crazy thing is the car made good runs on the eurocharged dyno on 93 plenty of power to hit 11.9's in good air. Now it runs weak on 93. Perhaps i had a tank of 93 that just had a high mixture of eth in it and now the current has less. That would definiately cause a reduction in octane rating. and making the knock sensor pull a timing.

Sonoco makes 100-104 unleaded octane gas i think the later is oxygen enriched.