A national survey shows gas prices continue dropping across the nation. The average price of a gallon of regular gas at self-serve stations was $3.85 recently, down almost 15¢ from 2 weeks ago. Mid-grade went for $3.98 and premium went for $4.10. That's according to the Lundberg Survey of 7,000 gas stations nationwide, released recently. Diesel was at $4.64. The cheapest gas was in Tulsa, OK, where a gallon of regular cost $3.50. Anchorage, AL, was most expensive at $4.37. The CA average was $4.10, down 22¢ from two weeks ago. The Western states were the only region in the U.S. where gas remained above $4 a gallon on average.