It will be interesting to see what kind of trade value your car has. I think some of these places like CarMax, Carvana, etc. have been overpaying for cars over the last 18 months. Now the used market is soft for dealers (according to the used car auction guys on YouTube) and they can't unload some of their inventory without taking a loss. This might explain some of these CarMax prices that seem to be the same (or more?) than buying new...
If this was last year, I would have told you to contact Carvana, Vroom, etc. and see what they would pay you for your car. People were getting stupid money for used cars last year. But I think these places may have have wised up by now.
It seems like most dealers in the country are still selling cars for MSRP. I'm not sure if anyone is crazy enough to put a "market adjustment" on a Mirage. But you're in LA so anything is possible.
There's an Enterprise Car Rental office near me. I occasionally see a Mirage sitting in their lot. One of these days I'm going to rent it so I can drive a CVT for myself. It sounds like the CVT programming has come a long way since 2014.
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View my fuel log 2015 Mirage ES 1.2 manual: 52.2 mpg (US) ... 22.2 km/L ... 4.5 L/100 km ... 62.6 mpg (Imp)