I'm road tripping right now vicariously through you, this is great! Tough luck so far on the halves and low dime counts, keep playing those numbers though and you'll score today I'm sure. good luck!
Are you just driving around to a bunch of different banks? I did this back at the end of December buying all the CWRs I could find and went 119 miles only to find one Roosie, a proof PA clad quarter, some wheat cents, and like one war nickel. Hopefully you have a hybrid or gas efficient vehicle.