Personally I'm expecting a very long life for these Jazz e:HEV vehicles. Better than previous generations (which was excellent). Because now the transmission seems very sturdy and the engine mainly working at optimal rpm for power generation.
Unless you purely use it on the highway at 110-140km/h, still going to be fine because it seems like a good Honda engine. But here the engine would get a lot more punishment.
The only thing I'm not sure how long will last is the high voltage battery life.
Anybody knows if somebody had to adjust the valves yet and at which mileage?
To my way of thinking, even if you do highway/motorway driving the engine is still not going to taxed or punished as much as a conventional ICE engine. The constant switch between electric/hybrid/petrol means the engine is very rarely under full load. I reason that my 40k+ mileage has only stressed the engine to an equivalent ICE mileage car of say of 25k miles.
The electric battery is guaranteed for 8 years... and I assume by that time battery technology will have improved and become such that you will just replace the old with a new one.
Does the engine require valve adjustment, is it the same set up as previous generations or again like my previous point about a less stressed engine and valve wear is negligible compared to pure ICE motors. The only things I will be asking at my 4th service is when my brake simulator will be replaced and when does the cam belt need changing?