Mine are at 44psi -- ride is excellent, and in my experience, I can take the corners at highest speed at this psi (I live in a hilly area).
My updated programming did NOT improve mpg whatsoever. 10.9 from the beginning, 10.9 now at 12,000 miles (in only 7 months!!
). Then again, I think I got the improved throttle response programming earlier than anyone here. So the improved mpg programming could be available more recently. Hmm.. gotta ask next oil change.