me and my girlfriend have been discussing taking a road trip in the US this July. Since we're located on Brazil (I'm brazillian, she's brazillian/italian), information regarding our travel isn't exactly easy to find.
Earlier this afternoon, quasi randomly searching wikipedia for information on the subject, I "discovered" the US-50. (: Since her parents live in DC, we figured that would be a great choice, plus it's got all the AWESOME places and backroads, etc.
I've been gathering what I found on pretty much two non-extensive sources (wikipedia's articles and this website) and obviously it's not near enough. Can you please give me both useful information regarding this trip and sources (books, websites, etc) for such information? We need to know the basics: pros and cons, average expenses, best affordable car rental options (companies and models).