30 gallons of extra fuel, being conservative at 15 mpg that give me, 450 extra miles.
~820 miles of range (taking out a few gallons for reserve)...that's pretty awesome, especially if you're looking to be selective on where you get your fuel from.
I'm glad the installation worked out so well. Mounting the fuel filler on the inside of the bed seems like a smart move. I'd be interested to see if Titan Tanks ever updates the controller and pump units; I've heard other Titan Tank owners mention the same thing about how the transfer was slow and the components looked somewhat cheap. But overall, people seem happy with these auxiliary tanks.