The 2007 Denmark paper that initially proposed the EEDI to the IMO at MEPC 57 (MEPC 57/INF.12) stated that "it is not inconceivable that design indices or equivalent may be applied retrospectively to existing ships". Classification societies regularly undertake voluntary EEDI application to existing ships.

RightShip has created the EVDI to enable older vessels to be compared to existing vessels with an EEDI.

As outlined in DNVGL’s review of RightShip’s methodology in 2015, a like-for-like comparison of efficiency is achievable with EEDI and EVDI.

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