Before revision: Specifications The higher conversion efficiency of the Stirling cycle compared with that of radioisotope thermoelectric generators (RTGs) used in previous missions (Viking, Pioneer, Voyager, Galileo, Ulysses, Cassini, New Horizons, and Mars Science Laboratory ) would have offered an advantage of a fourfold reduction in PuO2 fuel, at half the mass of an RTG.
After revision: Specifications The higher conversion efficiency of the Stirling cycle compared with that of radioisotope thermoelectric generators (RTGs) used in previous missions (Viking, Pioneer, Voyager, Galileo, Ulysses, Cassini, New Horizons, , and Mars 2020 Mars Science Laboratory ) would have offered an advantage of a fourfold reduction in PuO2 fuel, at half the mass of an RTG.