Effect of Transport Road Slope on Fuel Consumption of Coal Mine Transport Truck Dessy Lestari Saptarini, Rachmat Hidayatullah, Abdi Marul and Teguh Suprianto E3S Web Conf., 500 (2024) 03006 Published online: 11 March 2024 DOI: 10.1051/e3sconf/202450003006