Re rain and range.
I’ve noticed a pretty significant effect on the motorway – about 10-15% ish drop in predicted range on a 3 hr journey where the car predicted enough range to get to the destination before setting off, but dropped considerably after driving through fairly heavy rain for an hour. Once the rain cleared up the predicted range went back up. I didn’t track efficiency at the time but think this equates to about 10-15% “ish” based on the predicted range changes.
It makes sense – rolling resistance will increase due to displacing the surface water on the road. Moving dry air past the car at 70MPH is surely easier than rain plus raindrops which are more or less stationary compared to a cars speed.
I can’t see lights and wipers making any measurable effects – they’re pretty small power drains especially with modern LED lights – 15W or so each, so lets say 60W total for the whole car. I reckon my ETron uses about 26kW at 70MPH, so the lights account for 0.2% of the power consumption on the motorway.