[Dimitrij]

In addition to what others have already said, I would add that your long-term average fuel economy with a Gen4 Sienna is probably going to be a lot better than with an 2019 Odyssey. As per Fuelly, on average one could count on approx. 50% improvement, but you may go all the way to 80% if you follow the @wscan recommendations.

That said, the Gen4 Siennas are expensive and if the only avenue of savings were the fuel economy it might take you many years to recoup the investment. Luckily, the Sienna is likely to have lower maintenance and repair costs as well.

Finally, the Gen4's exterior design reminds us about the root "van" in the word "vanity", as it really looks modern, purposefully sculpted and composed, unilke the poor Ody that use to be an optically clean, handsome vehicle until Honda decided to give it a saggy rear a few years ago .

EDIT 2/23: @Drivesmarter100 : A screen shot of a 13-min trip. If it had been only 10 minutes, I'd be glad to get 20 mpg/12L/100 km. At the same time after 10 minutes the efficiency went all the way into the mid-40's (5-6L/100) in suburban driving.

 

[Dimitrij]

I got a 2021 LE AWD and live in northern Ontario and I commute 80km one way to work. 6,6L/100km during the summer months. 7,2L/100km during winter months with snow tires. Last winter I notice my fuel consumption starting to creep up (8L/100km). When I installed my summer tires, I zeroed my consumption history as I always do when changing tires. I was getting 8,6L/100km with my summer tires. I asked to dealer to check my hybrid system and they came back with 8,1L/100km, "seems fine". I replaced my 12V battery and my consumption is now 7,4L/100km. Better, but not at my usual 6,6L/100km. I suspect my hybrid battery is getting weak. My OBD reader says my battery is at about 43% life expectancy (123000KM) I even check with Dr. Prius and did the load test and it came back "46,45% capacity left, it is in bad condition but will still run". I guess it seems fine.

In the US, the hybrid traction batteries are warrantied to 150K miles, IIRC "to retain 90% of the capacity". If Canada has a similar warranty, you are most likely covered.