I'm back, and just a preliminary run through of numbers it looks like I spent about $1000 on this trip - 3 weeks of driving 5,000 miles and tent camping. Thank god for cheap gas! It looks like I spent about $400 on gas. The lowest price I saw was $1.99 in Texas but in general it was between $2.02 to $2.15 a gallon. Campsites were generally about $15 each, some $10 and some up to $22, so it averaged about $13 per night. The rest of expenses was for food, ice for the cooler, and other incidentals.