I have a 2006 Prius, replaced a Ford Explorer. I do a ton of stuff with the school and theater and haul a bunch of stuff. I can get a much in the Prius length wise as the Explorer, but the hatchback makes me get a little less height wise. With the front seats all the way back my son, 6'1" has leg room.We took it to Disney, me, SIL, both of us Pooh size, DNiece in a car seat, DS-6',his football tackle friend and the guys laptops out, DN had a personal DVD player...4 suitcases, 3 other bags, and a bigish ice chest...Then we bought several large bags of stuff. It was not roomy, but was as comfortable as the old Explorer, or so the guys said.
After 5 years I get up to 53 MPH on the way to WDW, going with fast traffic, over 78...
DH has a Camery Hybrid, and he only gets about 43-45 MPH, it just went over 100 thou miles a few days ago. We had to replace the water pump.
I am amazed at the room in my Prius, and I do love it. DH has leather seats, that are heated. It is a little more comfortable then the Prius, but both have taken us to WDW a ton of times. He has a sun roof...
The very best milage I got was 101.3 MPH, going downhill right after I filled up. I did take a picture!