Here's what Dan at Chrysler said:

Show car aka y93 could have been a few things:
1. Extra care taken to dress overall appearance (exterior paint) interior trim/finish inspection
This tag could have showed up for a few reasons:
A. Dealer showroom floor model
B. Show circuit car
C. Press fleet car
D. Special order paint (maybe a way to limit/resolve orange peel)

I asked him about A, B & gas and am waiting on a response. I'll invite him to the party.