The news shows U.S. refiners are going back to the trend earlier this year of turning oversupplies of crude into too much fuel sitting in storage.

The benchmark for U.S. oil prices hovered below $50.50 a barrel Wednesday morning, about a 50-cent dip for the day.

Distillate fuel levels grew as well, increasing by 2.5 million barrels, for the fuel that’s used to create diesel and heating oils, according to weekly data from the U.S. Energy Department.

Despite the oil inventories dip, storage levels are at upper limit of the average range seasonally, the Energy Department said. However, gasoline storage levels “are well above the upper limit of the average range.”