Utada has been and is currently making a fast-paced West-coast American promotional tour. She has been making radio appearances all across the west:
(Note we don't have all the interviews from these stations... yet)

March 18:
@ 106.1 Kiss FM in Seattle
@ C89.5FM in Seattle [SeattleWeekly blog] [U3blog pic]
[UPDATE]@ KUBE 93 in Seattle [video]
@ Z100 Music Station in Portland (Thanks to Mick Lee from Z100 for letting us know)
@ KWYL in Reno, Nevada

March 19:
@ KDND 107.9 The End in Sacramento [video2] [video3] [pics]
[UPDATE]@ KSFM/102.5 in Sacremento (Recorded interview) [video]
@ KBMB/103.5 in Sacremento (Recorded interview)
@ KNGY in San Francisco
@ KYLD in San Francisco
@ KMVQ in San Francisco
@ in LA

Monday March 23:
@ 'On Air With Ryan Seacrest' + performance [UPDATE]: Looks like this won't be live, but a pre-recorded interview/performance for a later date.

Tuesday March 24:
@ performance on KTLA's morning news [source] [VIDEO]