how much range degradation should I expect in the summer months? today running errands my range went from 249 to 177 (72 miles) but only traveled 54 miles. applying this this ratio to 326 mile advertised range I would only get a range of 245. most of the driving was high way with two short stops and a 40 minute ferry ride where we ran the air conditioner, a loss of 4 miles. 2021 model Y long range.