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Apostolaki-Iosifidou et al. [1], published in the May edition of Energy, is an important contribution to the field of vehicle-to-grid (V2G). It is the first publication to document the roundtrip efficiency of V2G, a critical element for assessing its economic viability. Roundtrip efficiency was found to range between 53% and 62%. This contrasts with existing V2G economic analyses, which either assume...