my 2012 P85 is at ~35k miles with lifetime wh/mi of 317. I have aftermarket 20" wheels. While it was in for service, my loaner was a 2013 S85 with 38k miles riding on 19" wheels. Service took 5 days. I have a regular drive I do several times per week of about 25 miles round trip. In my car, I consistently average around 315 wh/mi for that trip. The loaner S85 averaged ove 340 wh/mi. Neither car in range mode. I thought S85 was rated more efficient than P85. My experience exactly opposite. What gives??? Any guesses?