The 2012 Nissan Dualis (2.0‑litre petrol) is reasonably thrifty by early‑2010s SUV standards, but it won’t sip like a scooter.
Official combined figures are around 8.0 L/100 km (2WD manual), ~8.1 L/100 km (2WD CVT), and ~8.4–8.6 L/100 km (AWD CVT).
Expect real‑world numbers closer to 9–11 L/100 km around town and about 6.5–7.5 L/100 km on the highway, depending on load, tyres, and how enthusiastic your right foot feels.
The longer Dualis+2 is much the same, with a smidge more weight and a smidge more thirst.
Consult official documentation for exact figures.

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