What fuel economy are you getting? I don't think the 2.2K is worth it , but it is up to you. I personally love the smoothness and super low rpm's on the highway and if you stomp on it it shoots up to the correct spot on the power band pretty much instantly (at least the 2 times I've done it).
The reason I would prefer the manual is for engine off coasting or if you are one of the mirage owners that is going to lower the car and put it on some sport tires to have some fun.
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View my fuel log 2014 Mirage ES 1.2 automatic: 54.7 mpg (US) ... 23.3 km/L ... 4.3 L/100 km ... 65.7 mpg (Imp)