When drove back to Lubbock from taking delivery in Austin, I charged in Abilene. I left with 200 miles of range, figuring that was enough cushion for the 170 mile drive. I pulled into my garage with 10 miles left, and learned that driving 75 mph doesn't get you a 1:1 miles-driven-to-range-used ratio, haha. I drove to Abilene this weekend and had two wildly different range usages. From Lubbock to Abilene, I decided to go 65 mph to see what effect that would have on range. I did the 170-ish miles with 296 w/mi average and using 185 miles of range. Coming back, I used 245 miles of range at 412 w/mi. Talk about being glad I decided to top it off before I left! Abilene to Lubbock is uphill, elevation change is about 1,500 ft. so I imagine that plays a part. There was also a 25-ish mph crosswind most of the drive. Would those two things account for that drastic of a difference? (I'm assuming that IS a drastic difference.) I wouldn't think a 5 mph difference in speed wouldn't be THAT big of a factor.