A number of states have wiper/lights on laws, sharing a ride today in the rain elicited a comment that that was the law in TN.
Why not just leave your lights completely off until dusk? If you are concerned with energy consumption, that it the only choice that makes sense. The daytime running lights are only activated in the front anyway I think, completely useless on limited access highways.
2018 Kia LX HEV Metal Stream with Advanced Tech