??? I don't get what you are saying.......on the highway........you run less than stoichiometric(sp?) if you are asking if the AEM can do this........yes......on my friend's big turbo supra........he runs like 17:1 on the highway.......and on wot, he is at 12:1.........make sure you have a professional tune your AEM, if not it is really easy to pop your motor.