What is the intended use case scenario? Will your son be driving alone most of the time? Car pool a lot of passengers? Carry a lot of cargo?

How about a TD Crosswind? It's sort of a middle ground between the Innova and Advie as far as power and fuel economy.

Btw, we've had an Adventure in the 90's when it was first introduced. My dad's comments were mahina and mausok. And the rear A/C kept dripping and making noises. Don't know how much has changed since then.