Well. folks, the bad news is.....
The Arizona DMV considers the purchase date, not the date one registers the vehicle, as the operative date on which to levy the sales (use) tax. Yesterday, Monday the 4th, we were charged the higher rate. Today, this was confirmed as accurate by the Problem Resolution Office of the Arizona Dept of Revenue.
Thus any vehicle purchased prior to June 1, 2013 is being charged the additional 1%.
We'd sure like to be made aware of any change in this situation, should someone encounter it.
Thanks