The Iowa Renewable Fuels Association (IRFA) recently submitted comments in response to the Environmental Protection Agency’s (EPA) request for information on the Clean School Bus (CSB) Program. The EPA sought feedback on a broad range of fuel options that school buses could use to reduce emissions, including biofuels, natural gas, and hydrogen, in their revamping of the program.

In its comments, IRFA strongly recommended allocating substantial resources towards biodiesel infrastructure to enable the use of B20 (20% biodiesel, 80% petroleum diesel) or higher blends, engine modification technologies for buses to use blends as high as B100, and incentivizing the purchase of biodiesel to allow school districts to try it in their fleets.

IRFA participated in a study with Humboldt Community School District in Iowa to evaluate the benefits of switching its fleet from conventional diesel to B11. The study found a 3.4% increase in fuel economy, an 11.2% decrease in fuel burned for DPF regeneration, and consistent results when more buses in the fleet were switched to biodiesel.

“IRFA recommends that EPA allocate CSB grant funds toward helping “buy down” higher biodiesel blends for participating school districts. They may be interested and willing to make the switch to blends such as B20, but making any kind of change can be a risky decision, especially for districts with limited budgets. As demonstrated by the Humboldt pilot study, school districts that are incentivized to compare biodiesel blends with conventional diesel will see benefits, making continued adoption more likely.”