The 4cyl caravan and 6 cyl venture are both rated higher mpg than the transport.
Transports and Ventures suck (poor rating) in the crash test:
Toyota Previa even worse.
Crash ratings: 40 mph off center hit (driver to driver)
Previa 2 broken legs, broken neck and fractured skull.
Venture: 2 broken legs and concussion.
Caravan: 1 broken leg
Windstar: walk away
Sienna: open door and walk away
Odyssey 1999+: walk away