Originally Posted by sschmelcke
i only fill up with 87. i found no difference with 93 especially when the car isnt designed to take advantage of it
Me too. I only put 93 in there so that the lower octane rating wouldn't be a limiting factor during the tune. Our compression ratio is high enough for a 6 cylinder that its a bit safer to run 89 during the summer months. Still, with the stock ECU I got the best milage and performance with 87. I'll fill her up with 87 after this tank is gone and see if I get knock or any issues. John thinks we should be fine.