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Great Smoky Mountains National Park worked with East Tennessee Clean Fuels and the Land of Sky Clean Vehicles Coalition to shift to domestic fuels and advanced vehicle technologies. In 2013, the park replaced three gasoline pickup trucks with all-electric vehicles, converted five gasoline mowers to operate on propane, and installed four publicly accessible electric vehicle charging stations. In 2015, the park added four propane pickup trucks and installed two propane refueling stations. These activities are estimated to help the park reduce its annual emissions by almost 40 million tons of CO₂ and displace the use of nearly 8,900 gasoline-gallon equivalents of petroleum per year.