While there is certainly anticipated growth in electric-powered commercial vehicles in the coming years, diesel fuel will remain the dominant way commercial vehicles are run for the foreseeable future, according to a report by IHS Markit released on Sept. 18.

The report predicts that 66% of new medium- and heavy-commercial vehicles that will be sold in the U.S. in 2040 will be fueled by diesel—whether diesel or diesel-hybrid vehicles. Today, that number stands at nearly 80%, per IHS Markit’s study, “Reinventing the Truck.”