If you find a leftover '19 somewhere, the average Mitsubishi dealer may not cut you a great deal on it. The reason they have a 2 year old new Mirage in the first place is probably because they are a terrible dealer for selling Mirages. I probably wouldn't pay $9K for a "new" 2-year-old Mirage right now, but I doubt anyone will discount one that deep.
If you're willing to wait a few months, I'd bet you'll be able to get a great deal on a new 2021 from White Bear Mitsubishi. This is probably the best dealership in the country for selling Mirages at low, no-BS prices. When they are well-stocked, they have 50+ Mirages for sale...with about 20% being manual transmissions. They put no-BS pricing on their website...so you know exactly what you'll pay.
They are a little low on stock right now, but you can still buy a 2020 ES CVT from them right now for $12K. Once their supply catches up, I wouldn't be shocked to see them selling 2021 5-speed ES models for $10-$11K in 3 or 4 months from now. If I was buying a new Mirage, that's the first place I would look...and they are a 10.5 hour drive for me.
You will often see super-low prices on new Mirages from dealers in Florida. But they almost always have tons of fine print gotchas...including $899 doc fees and crazy stuff like that.
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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)