The 2023 Nissan Z is available in multiple trims, each with its own estimated fuel economy, here are the EPA estimates for each trim:

1. Proto Spec : 18 MPG City and 24 MPG Highway
2. Sport : 18 MPG City and 24 MPG Highway
3. Performance : 18 MPG City and 24 MPG Highway

It is important to remember factors such as driving style, weather conditions, and the use of features such as Eco mode can impact fuel efficiency.