I've had three Gen 2s, so I know it. One was a trim 6b. Or was it 6a? I forget. I just don't know why they decided to muddy things even worse than when they played around with the Roman/Arabic numbering. That was crazy, too. Not to mention the trim V (5) vs the Prius v (vee). LOL! The Plus/Premium/Advanced is pretty vague, too. Plus what? Sounds like it's better than something else. Advanced sounds better, too, but then there's the Plus. Is it above the Advanced? But then what did they Advance from? And the Premium; that has to be the very best, right? Nope. It's just like McDonalds insisting on naming their only two french fry size choices as "medium" and "large." By definition, medium is in between, but there's not enough sizes for an "in between." And then there's the deer-in-the headlights look when you point that out to the poor uneducated cashier who can't even make change without the cash register doing the arithmetic. My motto? "Eschew obfuscation!!"