Exceptional Calculation for Elevator

My read on ASHRAE-90.1 and numerous forums, is that USGBC may allow for an exceptional calculation to be performed for elevator energy savings, provided that; 1) Schedule of operation remains the same baseline and proposed. 2) Cut sheets indicating energy demand for both options is included 3) Calculations supporting the energy savings. 4) Demonstrate that "acceptable conventional practice" supports my baseline design case. For elevators there are no minimum efficiencies published nor are there any "standard practices" for new elevators in new facilities. I am essentially left with the word of the elevator supplier that the baseline design for my two story building would be a hydraulic elevator and that I can show energy savings for my Ecospace and Monospace elevators. Does anyone have any recent experience in submitting on this type of ECM and what have been the results and/or comments back from the LEED reviewer? There is a signifigant energy savings betweent the baseline and proposed that I am hoping to include in my model. Thank you in advance.