Hi crispy -
Welcome, from another small car fan!
I've yet to drive a Spark, myself, but would like to try one. But since one of my main interests is in efficient small cars, I was frankly disappointed by the MPG performance of the Spark. I was hoping for better. It's a heavy car for its size, too (part of the problem), and the economy of its slushbox automatic (which the vast majority of people order) is frankly terrible. I'm sure the imminent arrival of the CVT Mirage is one reason GM has said they're planning to change to a CVT in the Spark.
I really like the looks of the Picanto - more than the Mirage, actually. Kia's design studio has been doing really good work the last few years.
But I wonder if their aerodynamic engineering is as good as Mitsu's.
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View my fuel log 2014 Mirage ES 1.2 manual: 62.4 mpg (US) ... 26.5 km/L ... 3.8 L/100 km ... 74.9 mpg (Imp)