Calling it 0.5% is generous.

* Only when it rains. (It's worthless the rest of the time)

* Only if all of the motor power is saved. (Presumably the new mechanism uses some power)

* Only if the motor is running at full power the entire time it rains (even on "high" this is not true).

* Only if range is not otherwise impacted by the rain (nope).

If it rains all the time, and the above are all true-- yes, it's worth 0.5%.

While I agree with you and am excited for whatever improvements can be made, I think the most likely retort to this argument is "While you're worrying about 10 0.5% savings, your competitor is focusing on optimizing things that actually matter."