To reinforce the message, biofuel producers and retailers from across the country are fanning out across Capitol Hill for Growth Energy’s spring fly-in. From April 16 to April 18, they will remind lawmakers that E15 has saved consumers an average of 10 to 30 cents per gallon—and up to one dollar per gallon in some places—but without an emergency waiver from the Biden Environmental Protection Agency (EPA), American motorists could lose access to these cost savings on June 1.