The U.S. Administration is mulling over whether to temporarily remove the summertime restriction on the sale of the higher-ethanol gasoline varieties in another policy attempt to lower high gasoline prices, Reuters reported on Thursday, citing sources with knowledge of the deliberations. The U.S. typically restricts the sale of the 15-percent ethanol-gasoline blends during the summer driving season because of concerns that it would increase smog in hot weather. The 10-percent ethanol-gasoline blends are being sold all year round. Now, as a potential…