Navi is launched by Honda, It is a scooter and bike hybrid and that is why it is a very different looking vehicle, some may find it attractive and some might not. Basically, it was designed for the youth. It has similar dimensions to the well known, market captured brand Activa of Honda itself. Having that said Honda Navi is powered by 109.2 CC air-cooled engine with 8bhp of power @7000 Rpm.
The mileage claimed is around 50/kmpl and is achievable as the vehicle is light in weight. The mileage is average compared to other options available in the same segment.
Comfort on the Navi is debatable as it has narrow seats which could be a little problem.
It has the same engine as Activa and is very maneuverable as the vehicle is small and light.
The major drawback of the Navi is it miss out on much essentials. It has very basic instrument cluster without fuel meter and also no engine kill switch is present. Overall, it looks very dated.
The Road grip is not much of an issue but the brakes are not that strong.
I would suggest people to look for other options available before buying Navi. As other options will be more appealing, ergonomic, and comfortable.
Thanks!