I can't remember the last time I drove 100 km/h here. For what I do, this would make an excellent city car
In some cases, a larger, more powerful engine, will be more fuel efficient than the opposite. I think this will very much be the case here, where the engine is too weak and it will consistently be strained, using more fuel in the process.
I'd like to see Honda build 2 of these, one with the 1.5L and one with the 1.8L or a 2.0L (or even the 2.4L in the CRV). Then, test them and see the fuel economy differences.
THEN, test them all in real world driving, and see.
The last gen I4 Rav4 used barely 1L/100km less than the V6 because the V6 was plenty of power that was seldom tapped into, and the I4 was always buzzing to keep up.
By the way, the HR-V looks like Honda followed Nissan's stupid V-motion styling. I hate it. HATE it.