Indiana farmers can now run red-dyed, tax-exempt farm diesel on public highways after Governor Mike Braun ordered a suspension of off-road-only limits on Wednesday — a response to state diesel prices running 77% above year-ago levels.

The exemption covers hauling corn and soybeans to markets and grain elevators between Oct. 6 and Nov. 4, spanning the core of the state's harvest and transport window. Dyed diesel normally carries restrictions to off-road use, with the red dye serving as a compliance marker for enforcement.

For growers, the economics are direct. Bulk-purchased farm diesel costs 60 to 70 cents less per gallon than standard on-road diesel at retail stations, according to the Indiana Soybean Alliance and Indiana Corn Growers Association. Applied across the fuel burned by trucks and semis moving grain from field to elevator through a multi-week harvest, that spread translates into a meaningful reduction in per-acre hauling costs at a moment when fertilizer, chemical and machinery bills are already elevated.

The grower groups flagged a gap in the order. Harvest will likely still be underway after Nov. 4, they said, leaving a question mark over the back half of the season.

"We welcome the relief during a time when we are already experiencing high input costs. However, we need certainty through the entire harvest season and guidance on transitioning back to regular diesel when the exemption concludes," David Hardin, chair of the soybean group's membership and policy committee, said in a statement.

The request for clear transition guidance reflects a compliance risk: drivers caught with dyed diesel in on-road tanks after the window closes face penalties, so an abrupt expiry mid-harvest could force farmers to drain tanks or rush haulage to beat the deadline.

Indiana is not acting alone. At least nine states — including Nebraska, South Dakota, North Dakota and Texas — have taken steps within roughly the past week to curb fuel costs. Braun also extended his pause of Indiana's state gasoline taxes. The timing is hard to separate from politics: prices remain sharply elevated just weeks ahead of the Nov. 3 federal, state and local elections.

The national average diesel price has edged lower since hitting an all-time high on Sept. 22, but the relief has been modest amid global supply chain disruptions tied to the Middle East and elsewhere.

The pressure point may tighten again. Mike Castle, commodities economist at StoneX Group, says an already squeezed global fuel market is set to tighten further as Chinese refiners suspend exports for October. Castle also notes the U.S. has asked EU governments to begin releasing diesel reserves to ease supply pressures.

The federal government faces its own call to act. The Iowa Corn Growers Association is among the groups pressing Washington for a national waiver allowing farm diesel use on highways through the current harvest season — a step that would spare farmers in states without Indiana-style orders from paying full on-road prices.

For now, Indiana growers have a four-week window. Whether state fuel tax pauses and dyed-diesel exemptions extend past election day — and whether a federal waiver materializes — will determine whether the 60-to-70-cent spread holds through the final bushels moved this fall.