Lots of comments and threads have occurred here regarding combining FE/LE spaces and Electric Fueling Charging stations.

FYI: A CIR has been posted (as of April 1, 2015) and it offers a prescription for how to do this. See CIR ID#10410

Ruling:
"Projects may achieve this credit using a combination of Option 1 and Option 2. Preferred parking for low-emitting and fuel-efficient vehicles must be provided for 5% of the total parking capacity, as required in Option 1. Fueling stations may be substituted for preferred parking spaces to meet this threshold such that one fueling station is equivalent to 1.67 preferred parking spaces. All other credit requirements (such as the location of the preferred parking spaces and the capacity of fueling stations) apply. The special circumstances section should be used for additional documentation."

The "preferred" location still seems to be tricky per the conversations / threads on this here in LEEDuser, but.... at least the combination question is finally spelled out.