Actually, its in MPH. The Toyota pickup chassis came from Japanese Toyota city factory. Then shipped to forest hill. To Winnebago industries. Factory. The Speedo. Is All MPH. No kmh. Thank god. We. Set the tach.and drove. Round trip. We averaged. 21. That's going 60 mph. Hills at 4 per grade were a little tricky. The 17.5 Gallon fuel tank. Is amazing. Before you question our calculations. Maybe. Stop and think. This unit has fuel efficient modification.