Just filled up my car, and I paid $4.11 per gallon. Using the calculator from Professor Hamilton, and the current price of Brent crude oil, the national average should be around $3.68 per gallon. That is about the current level according to Gasbuddy.com (see graph below). In California, where I live, gasoline prices are always higher than the national average. Update: Some of the recent increase in California was due to the refinery fire in Richmond
The following graph shows the recent increase in gasoline prices. Gasoline prices are down from the peak in early April, but up about 30 cents over the last seven weeks. Note: This will push up the headline CPI numbers.