Quote Originally Posted by ahausheer View Post
I can't recommend you do anything against the owners manual, but no, I do not think the California engines are set up differently. I just think for cost, legal, or emissions reasons, Mitsu didn't bother to certify it in America as e20 compatible. The engine specifications thread on this website specifies its E20 compatible as does public marketing material from a few other countries.
California has had different emissions equipment for as long I recall.