Rain repellent.

[john1000uk]

Presumably the application of a good quality rain repellant should reduce drag and therefore increase battery range. Has anyone come across any tests of this?

 

[Ian Key]

In theory a clean polished car will have a lower drag coefficient (I got a dictionary for Christmas ) than a dirty one.

Testing it out would mean a wind tunnel as in the real world there's too many variables which can skew the results. Rain, temperature, wind, road surface, etc. including the size of any vehicle you are following will all have an effect.