I found something interesting. Using Edmunds TCO calculator, I put in 2016 through 2022 Toyota Siennas, all 8 passengers, LE, 2WD models, and the cheapest ones (by true cost of ownership) were the brand new ones (2022 or 2021)...
2016 $46,401
2017 $49,213
2018 $50,229
2019 $51,370
2020 $53,279
2021 $38,373
2022 $38,976