Designated parking spaces must be provided to meet the requirements of each credit independently. One parking space cannot contribute to both credits by being designated for carpools (SSc4.4) and for low-emitting and fuel-efficient vehicles (SSc4.3).
Do you know which LEED credits have the most LEED Interpretations and addenda, and which have none? The Missing Manual does. Check here first to see where you need to update yourself, and share the link with your team.