[souprock]

It could work for a kid or two, but that family size isn't enough to prevent extinction. Somebody needs to have more kids.

For me, a load of groceries fills 3 shopping carts in the store (packed to the top and overflowing) and 4 once bagged. That seems to be about 42 cubic feet (1.2 cubic meters) of food, with weight likely approaching a ton. I still have to buy a bit more during the week, since we go through about 2 gallons of milk per day and I'm just not going to attempt bringing home and storing 14 gallons of milk.

I use a 3-ton vehicle by curb weight. It can be a 5-ton vehicle when filled. The 5.4L V8 gets 11 MPG in the city. It's actually fuel-efficient on a per-person basis when I fill most of the 15 seats with people; think of it as 3 times a 5-seat vehicle that does 33 MPG.