Europe has CO2 taxes, Japan does not. There's less reason for Japanese cars to be economical.
'Sporty' cars with curves are generally poor aero-wise.
The GT-R is quite boxy and very good aerodynamically, it matches the 'boxy' B Class Eco Package.
But the Mazda 3 sedan is quite curvy and matches the 0.26 of the other two.
Basically, it's 'A', but I don't think this topic has any real merit.
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