Farmers could see lower grain hauling costs and fewer transportation bottlenecks under a proposal advancing through Congress that would allow heavier six-axle semis on interstate highways. An amendment introduced by South Dakota Congressman Dusty Johnson was added to the BUILD America 250 Act, creating a voluntary pilot program allowing states to permit six-axle trucks weighing up to 91,000 pounds on federal interstates. Agricultural groups, including the Soy Transportation Coalition, say the change would help farmers move grain more efficiently at a time of tight margins and high diesel prices. “Enhancing trucking efficiency could not be timelier,” the coalition said, citing rising fuel costs and continued pressure on farm profitability. Supporters estimate that a grain elevator using the heavier trucks could eliminate more than 800 trips per year while reducing fuel use by about 8,000 gallons annually. The coalition said farmers in states with higher weight allowances could save an average of $756 each year in fuel costs.