Does the factory o2 infact switch from lean to rich? Meaning it should show up on your wideband as switching from lean to rich. NOt switching at stoich to rich. correct? When i am at freeway speeds my wideband shows 14.4 and lower. is this normal? I have to assume that it would be cause at cruising speeds i am achieving 29 m.p.g. Maybe it's just a wideband error?? It is my second one. Any comments??