When we stopped for the night at I 15 exit 191 in Calif. (Calico, Peggy Sue's diner). On the West side of the freeway regular was $3.47. On the East Side, it was $4.07! (Two stations on each side) The only thing we could figure was that the owners figured you could afford more for gas going to Vegas, than returning. In S. Calif. Regular seems to be from $3.47 to over $4.00. We paid about $3.97 for diesel.