I can attest that using a gill block on the pre-2018 Leafs does improve winter efficiency.
1. possible slight aero improvement.
2. Less cold air across the battery
3. Less natural cold air into passenger compartment
4. Less cold air across heat exchanger/element, making heating more efficient.
I haven't tried blocking the small grill on my 2019 yet.
1. possible slight aero improvement.
2. Less cold air across the battery
3. Less natural cold air into passenger compartment
4. Less cold air across heat exchanger/element, making heating more efficient.
I haven't tried blocking the small grill on my 2019 yet.