In theory, it costs less. In the September to March -- four times a week? I calculated that will cost me $460 a month. April to August, maybe once a week. That's $141 a month, $126 if I can jump from the $25/mo tier to $0/mo tier (maybe not worth the hassle). So that's $3,850 a year for ~4,970km of driving.
My Odyssey cost $3,475 (fuel, insurance, maintenance) in comparison for 10,200km of service. So to own my own vehicle, I get 2.5x more kms of service for practically the same annual operating cost. We get to go on road trips in comfort in it, my wife and I miss being able to travel in a bigger vehicle and my 7 year old also doesn't like being stuck for hours in the Mazda.
So I looked at the Sienna.
Exterior - dings and dents consistent of a vehicle this age. Lots of stone chips on the front, consistent with highway driving.
Interior - practically brand new
Mechanical - superb with full service records. Winter tires on separate set of rims. He's including a roof box with it.
With 350,000km and asking $3,250, there's probably wiggle room. My wife at first was like "another beige minivan?" but when she found how smooth and comfortable it was an how responsive the 260 HP engine was, she was sold.