If Texaco added his gear, Transportation cost it would have been more like $5000 or more, that's about right. after a person buys all the gear and transportation you'll spend around $4000+ on the trail. $3300 seemed a little low for a 4 month hike
I seriously think he had a few Mail Drops mixed in their, and supplemented the food with food he bought at stores, the reason I say this is some of the cost at a few of the resupply stops seemed way low for the distances he was covering between some of the stops.
On my 2012 thru I spent $5700 total cost that includes Gear and transportation, so on trail I spent roughly around $4300, and it took me 4.5 months
Thanks Texaco this gives prospective thru-hikers a rough idea on how much they should expect to spend on trail.