It took an estimated 2,892 million gallons of diesel fuel and 411 million gallons of gasoline to transport farm inputs, commodities, and manufactured food products in 1977. Truck shipments made up 41 percent of total ton-miles in the food and fiber system and required 2,529 million gallons of petroleum fuels, or 77 percent of the total. Rail movements required 665 million gallons of fuel, or 20 percent. Barge shipments accounted for most of the remainder. Demands for transportation fuel in the food and fiber system are likely to continue to increase in the foreseeable future.