I was coming home from a 220 mile round trip journey and encountered a headwind on the return that pushed my wh/mile up to 380, a level that looked like i would arrive home with 0 miles. the car at 72mph seems to get about 70% of the ideal range meter. I was faced with the decision to slow down to 50mph or so or draft a semi truck. i got behind a car hauler and my wh/mile average went down to 260-270 which at times was better than ideal range. so drafting at 71mph added 30% to my range vs not drafting. I made it to the house with 20 miles still left in the battery.