ALTOONA, Iowa (AP) — The ethanol industry is prepared for a long fight to keep federal regulators from cutting current levels of biofuels blended into the nation’s gas supply.

The annual conference of Iowa ethanol manufacturers and supporters held in Altoona Tuesday would normally be an upbeat event celebrating the past year’s victories and planning strategies to expand markets. Instead, the industry is sharply focused on trying to persuade the EPA to reverse plans to reduce ethanol use in gas.