American Trip Megaupload What Is The Most Reasonable Vehicle For A Western-American Road Trip?

What is the most reasonable vehicle for a western-American road trip? - american trip megaupload

About 7 friends and I travel for a month and a half over the western U.S. and western Canada. What is the best vehicle for work? If the rent? What kind of traffic (if any) are large, cheap and fuel efficient?

I think a better question is, what is the cheapest vehicle of this type of trip?

Thanks