As baseball nears its trading deadline on July 31, some teams need to decide if their recent upward trend is a short-term phenomenon or something that the team can build the future around. But baseball is not the only industry where midsummer trends are examined closely to determine if they are indicative of the future. The same can be said for U.S. gasoline consumption in the summer. It is not unusual for gasoline consumption to pick up during the summer. This year, however, gasoline product supplied (EIA's proxy for consumption) as reported in EIA weekly data has shown a more pronounced seasonal rise compared with previous years. From early May to the week ending July 5, U.S. product supplied for gasoline increased 10 percent to 9.3 million barrels per day (bbl/d) (Figure 1). However, this recent uptick in demand is unlikely to represent the beginning of a major boost in demand. Even with the recent rise, 2013 year-to-date gasoline consumption is almost unchanged from last year, and the estimated rise in gasoline demand is based on weekly product-supplied data that could change as more data, particularly on U.S. exports, become available.
For the weeks ending June 28 and July 5, product supplied for gasoline surpassed the 5-year average, based on data from the Weekly Petroleum Status Report (WPSR) through July 19, gasoline consumption in 2013 has averaged 8.6 million bbl/d, 0.4 million bbl/d below the 5-year average and marginally above 2012 average consumption.
However, at least some of the recent increase in reported gasoline consumption could be a result of the way EIA estimates weekly data, rather than an actual sharp increase in consumption. EIA uses a proxy for weekly U.S. gasoline consumption called product supplied, which measures the disappearance of a particular product from the primary supply chain. The WPSR uses seven surveys to collect data from respondents across the primary petroleum supply chain, made up of refineries, pipelines, bulk and blending terminals, gas processing plants and fractionators, oxygenate producers, and importers.
For a specific refined petroleum product, product supplied is equal to production plus imports minus stock change and exports.
The element subject to the most change between the WPSR product-supplied number and the monthly number published later in Petroleum Supply Monthly (PSM) is U.S. exports. The export data used in EIA's monthly product-supplied calculation come from the U.S. Bureau of the Census, which releases the data on a monthly with a two-month lag. As a result, the weekly product-supplied data considered in this discussion are estimated initially using two-month-old export data. As a result, when the official U.S. export data is released, the weekly estimates of gasoline product supplied are updated (Figure 2).