We have an 8 passenger Suburban. We really wanted a 9 seater, but we could only find one (used) and the seller was shifty. We figured it'd be ok, only one seat too small and we could squeeze. I found out I was pregnant with #8 the very next weekend. :P Same thing happened when we bought a 7 passenger minivan a few years ago! So, we're planning to buy two jump seats to install in the back sometime before this baby is born so we have enough room.
I LOVE our Suburban, partly because DH drove a Suburban (that belonged to his parents) when we first met, so it has fun memories for me.
We get just under 14mpg -- that's an average on all of our driving, both highway and street. DH keeps track and could tell me the number right off the top of his head, LOL. We spend about $100 a week on gas, which isn't bad considering that DH commutes all the way downtown from the suburbs.
I do not love being a one car family. The Suburban was *supposed* to be my car so I could take the kids to do things during the day, but right about the time we bought it, DH's truck died the final death. He's considering buying a small, cheap beater car just for driving to work. That would make me super happy.
Right now, if I want the car I have to drive DH to work in the morning and go pick him up in the afternoon. That's an hour and a half round trip each time! But I do enjoy the quiet time in the car with him.