From the Bureau of Labor Statistics:
It is particularly important that gasoline price changes be measured accurately and reliably. Fortunately, gasoline is one of the few consumer goods for which there are many sources of price data.
The Beyond the Numbers article, Measures of gasoline price change, examines three measures of gasoline prices: the BLS Consumer Price Index for All Urban Consumers (CPI-U) U.S. city average for all types of gasoline, the BLS CPI average price series for all types of gasoline, and the Energy Information Administration Weekly Retail Gasoline and Diesel Prices for all grades of gasoline.
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