My wife and 14 yr old daughter and I are driving cross country this summer, to and from the West Coast, seeing many sights, for five weeks. We have a reliable but older Volvo wagon which would work o.k. but need to buy another car for after the trip anyway. Should we consider buying the car for the trip and what car should we buy? The Honda Element sounds good but doesn't get the best mileage. What's your opinion and Thank You!