Ethanol stocks, according to the U.S. Energy Information Administration (EIA), are at their highest level since March, and they are also up 8.8 percent versus the same time last year and 3.6 percent above the previous week’s total.. Despite the stock build, weekly ethanol production is down to its lowest point since April after dropping more than 7 percent in the past four weeks. For the year, however, production is 2.2 percent ahead of last year’s pace.

Supply-burdened low ethanol prices have not helped spur demand. Meanwhile, blending lags last year’s pace by 1.4 percent. That is due in part to lower gasoline demand, which is down overall by 1.5 percent but returning to more normal patterns after the interruptions fro...