Yep. Probably the former.
You know, the Swift GT had the same mechanicals as the Metro, but with a 100hp 1.3L twin cam and larger, grippier tires. It was actually a pretty zippy & fun car -- I'd say comparable in price & mission to what the Micra is today. Slightly better power:weight ratio, even.
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View my fuel log 2015 Micra S manual: 5.0 L/100 km ... 56.5 mpg (Imp) ... 20.0 km/L ... 47.0 mpg (US) ...