A couple more...
High mileage 4-cyl Accord with no options (not even sat) is classified as "YF" (received as a 5* for "F" rental w/ paid sat)
Buick Regal 4-cyl was classified as a "YF" on the key tag and contract, but showed as "G" on the final receipt. (this one was a 5* "G" rental, also w/ paid sat)