<article><p class="lead">US retail gasoline prices marked a rare late-summer increase last week, the strongest for the period since 2005. </p><p>National average gasoline prices increased by 4.4¢/USG to $2.193/USG, their highest average since mid-July, according to the Energy Information Administration. Prices have fallen during the week in eight of the past ten years, and last week marked the largest increase since a 6.2¢/USG increase in 2005. Current-year prices remain 44.4¢/USG lower than the same week last year. </p><p>Average prices rose in every region, led by a 5.1¢/USG increase in the US Atlantic coast, to 2.126/USG. Rocky mountain prices moved the least, higher by 1.5¢/USG to $2.229/USG.</p><p>US Gulf coast prices remained the lowest of any region, at $1.964/USG. But the regional average was also the narrowest to year-ago prices, at 12.7¢/USG.</p><p>National average on-highway diesel increased by 6¢/USG to $2.37/USG. US Gulf coast prices increased by 7¢/USG to $2.249/USG, following a week with several refinery disruptions, including a fire on a distillates-producing hydrocracker at Motiva's 225,000 b/d refinery in Convent, Louisiana.</p><p>US west coast prices posted the smallest increase, higher by 4¢/USG to $2.623/USG.</p><p><table class='tbl-excel'><tr><td class='tbl-header'>US average prices</td><td class='tbl-header'></td><td class='tbl-header'></td><td class='tbl-header tbl-right'>$/USG</td></tr><tr><td class='tbl-columnheader tbl-bold tbl-right'></td><td class='tbl-columnheader tbl-bold tbl-right'>22-Aug</td><td class='tbl-columnheader tbl-bold tbl-right'>15-Aug</td><td class='tbl-columnheader tbl-bold tbl-right'>&#177;</td></tr><tr><td class='tbl-rowspace'></td><td class='tbl-rowspace'></td><td class='tbl-rowspace'></td><td class='tbl-rowspace'></td></tr><tr><td class='tbl-subheader'>Regular gasoline <span class="tbl-italic">($/USG)</span></td><td class='tbl-subheader'></td><td class='tbl-subheader'></td><td class='tbl-subheader'></td></tr><tr><td class='tbl-left'>National average</td><td class='tbl-right'>2.193</td><td class='tbl-right'>2.149</td><td class='tbl-right tbl-italic'>0.044</td></tr><tr><td class='tbl-left'>East coast</td><td class='tbl-right'>2.126</td><td class='tbl-right'>2.075</td><td class='tbl-right tbl-italic'>0.051</td></tr><tr><td class='tbl-left'>Midcontinent</td><td class='tbl-right'>2.171</td><td class='tbl-right'>2.121</td><td class='tbl-right tbl-italic'>0.050</td></tr><tr><td class='tbl-left'>Gulf coast</td><td class='tbl-right'>1.964</td><td class='tbl-right'>1.938</td><td class='tbl-right tbl-italic'>0.026</td></tr><tr><td class='tbl-left'>Rocky Mountains</td><td class='tbl-right'>2.229</td><td class='tbl-right'>2.214</td><td class='tbl-right tbl-italic'>0.015</td></tr><tr><td class='tbl-left'>West coast</td><td class='tbl-right'>2.573</td><td class='tbl-right'>2.534</td><td class='tbl-right tbl-italic'>0.039</td></tr><tr><td class='tbl-rowspace'></td><td class='tbl-rowspace'></td><td class='tbl-rowspace'></td><td class='tbl-rowspace'></td></tr><tr><td class='tbl-subheader'>Diesel <span class="tbl-italic">($/USG)</span></td><td class='tbl-subheader'></td><td class='tbl-subheader'></td><td class='tbl-subheader'></td></tr><tr><td class='tbl-left'>National average</td><td class='tbl-right'>2.370</td><td class='tbl-right'>2.310</td><td class='tbl-right tbl-italic'>0.060</td></tr><tr><td class='tbl-left'>East coast</td><td class='tbl-right'>2.367</td><td class='tbl-right'>2.314</td><td class='tbl-right tbl-italic'>0.053</td></tr><tr><td class='tbl-left'>Midcontinent</td><td class='tbl-right'>2.342</td><td class='tbl-right'>2.273</td><td class='tbl-right tbl-italic'>0.069</td></tr><tr><td class='tbl-left'>Gulf coast</td><td class='tbl-right'>2.249</td><td class='tbl-right'>2.179</td><td class='tbl-right tbl-italic'>0.070</td></tr><tr><td class='tbl-left'>Rocky Mountains</td><td class='tbl-right'>2.435</td><td class='tbl-right'>2.394</td><td class='tbl-right tbl-italic'>0.041</td></tr><tr><td class='tbl-left'>West coast</td><td class='tbl-right'>2.623</td><td class='tbl-right'>2.583</td><td class='tbl-right tbl-italic'>0.040</td></tr><tr><td class='tbl-footer tbl-right tbl-italic'></td><td class='tbl-footer tbl-right tbl-italic'></td><td class='tbl-footer tbl-right tbl-italic'></td><td class='tbl-footer tbl-right tbl-italic'>— EIA</td></tr></table></p></article>