A year earlier, consumers in the Los Angeles area paid 9.3 percent more than the national average for a gallon of gasoline. The local price of a gallon of gasoline has ranged from 2.9 to 34.2 percent above the national average in the month of August during the past five years.or electricity, average prices per kilowatt-hour (kWh) and per 500 kWh are published. For utility (piped) gas, average prices per therm, per 40 therms, and per 100 therms are published.